UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

SCHEDULE 13D

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 2)*

RADIUS HEALTH, INC.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

None

(CUSIP Number)

ANSBERT GADICKE

MPM ASSET MANAGEMENT

THE JOHN HANCOCK TOWER

200 CLARENDON STREET, 54^TH FLOOR

BOSTON, MASSACHUSETTS 02116

TELEPHONE: (617) 425-9200

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

April 23, 2013

(Date of Event Which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.  ¨

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See §240.13d-7 for other parties to whom copies are to be sent.

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

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Explanatory Note:

This Amendment No. 2 to Schedule 13D (the “13D/A”) amends and supplements the Schedule 13D previously filed by the undersigned with the Securities and Exchange Commission on May 27, 2011 and amended by Amendment No. 1 filed December 27, 2011 (as amended, the “Original Schedule 13D”). This 13D/A is being filed to report the purchase shares of Series B Convertible Preferred Stock and warrants to purchase shares of Common Stock of Radius Health, Inc., a Delaware corporation (the “Issuer”).

All capitalized terms not otherwise defined herein shall have the meaning ascribed to the terms in the Original Schedule 13D. The Original Schedule 13D is hereby amended and supplemented as follows and, except as expressly amended below, the Original Schedule 13D remains in full force and effect.

“Item 2. Identity and Background” of the Original Schedule 13D is hereby amended and restated in its entirety as follows:

(a) The persons and entities filing this statement are MPM BioVentures III-QP, L.P. (“BV III QP”), MPM BioVentures III, L.P. (“BV III”), MPM BioVentures III Parallel Fund, L.P. (“BV III PF”), MPM BioVentures III GmbH & Co. Beteiligungs KG (“BV III KG”), MPM Asset Management Investors 2003 BVIII LLC (“AM LLC”), MPM Bio IV NVS Strategic Fund, L.P. (“MPM NVS”), MPM BioVentures III GP, L.P. (“BV III GP”), MPM BioVentures III LLC (“BV III LLC”), MPM BioVentures IV GP LLC (“MPM IV GP”) and MPM BioVentures IV LLC (“MPM IV LLC” and, collectively with BV III QP, BV III, BV III PF, BV III KG, AM LLC, MPM NVS, BV III GP and MPM IV GP, the “MPM Entities”) and Luke Evnin, Ansbert Gadicke, Nicholas Galakatos, Michael Steinmetz, Kurt Wheeler, Nicholas Simon III, Dennis Henner, Todd Foley, Vaughn M. Kailian, James Paul Scopa and John Vander Vort (collectively, the “Listed Persons” and together with the MPM Entities, the “Filing Persons”).

(b) The address of the principal place of business for each of the MPM Entities and Ansbert Gadicke, Luke Evnin, Nicholas Galakatos, Michael Steinmetz, Kurt Wheeler, Nicholas Simon III, Dennis Henner, Vaughn Kailian, Todd Foley and John Vander Vort is The John Hancock Tower, 200 Clarendon Street, 54^th Floor, Boston, MA 02116 and the address of the principal place of business for James Paul Scopa is 601 Gateway Blvd., Suite 350, S. San Francisco, CA 94080.

(c) The principal business of each of the MPM Entities is the venture capital investment business. Each of the Listed Persons is a general partner of various venture capital investment funds.

(d) During the last five years, none of the Filing Persons, to the knowledge of the MPM Entities, has been convicted in any criminal proceeding (excluding traffic violations or similar misdemeanors).

(e) During the last five years, none of the Filing Persons, to the knowledge of the MPM Entities, has been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

(f) Each of the Listed Persons is a United States citizen and each of the MPM Entities is a Delaware limited partnership or limited liability company, except BV III KG, which was organized in Germany and MPM NVS, which was organized in Bermuda.

In accordance with the provisions of General Instruction C to Schedule 13D, information concerning the managers and each other person controlling the general partners of the MPM Entities required by Item 2 of Schedule 13D is listed on Schedule 1 hereto and is incorporated by reference herein.

The Reporting Persons may be deemed to be members of a “group” within the meaning of Section 13(d)(3) of the Exchange Act, comprised of the Reporting Persons and the other stockholders party to the Third Amended and Restated Stockholders’ Agreement, dated as of April 23, 2013, as amended (the “Separately Filing Group Members”). It is the understanding of the Reporting Persons that the Separately Filing Group Members are filing separate Schedule 13Ds pursuant to Rule 13d-1(k)(2) under the Exchange Act.

“Item 3. Source and Amount of Funds or Other Consideration” of the Original Schedule 13D is hereby amended by adding the following at the end thereof:

On April 23, 2013, pursuant to the terms of that certain Series B Convertible Preferred Stock and Warrant Purchase Agreement (the “Purchase Agreement”), dated as of April 23, 2013, among the Issuer and the investors referenced therein (the “Investors”), the Issuer issued an aggregate of 700,098 shares of Series B Convertible Preferred Stock (the “Series B”) and warrants (the “Warrants”) to purchase an aggregate of 1,750,248 shares of the Issuer’s Common Stock (the “Common Stock”) to the Investors. Such shares were issued at a purchase price of $61.42 per share resulting in aggregate proceeds to the Issuer of $43 million. Each share of Series B is convertible at the option of the holder at any time into ten shares of Common Stock. The Warrants are exercisable through April 23, 2018 (the “Expiration Date”) at an exercise price of $6.142 per share. In addition, the Warrants are exercisable on a cashless basis (by surrender of the number of shares underlying the Warrants having a fair market value equal to the aggregate exercise price of the shares being acquired) until and including the Expiration Date. Certain rights relating to the Warrants were set forth in a warrant, dated as of April 23, 2013. The applicable per share purchase price and the number of shares issuable upon exercise of the Warrants are subject to adjustment for the occurrence of certain events, including stock dividends, splits, subdivisions, combinations, reorganizations and reclassifications. The MPM Entities participated in the offering and acquired an aggregate of 162,813 shares of Series B and Warrants to purchase an aggregate of 407,034 shares of Common Stock, for a total purchase price of $10 million. BV III purchased 5,103 shares of Series B and Warrants to purchase 12,758 shares of Common Stock, BV III QP purchased 75,899 shares of Series B and Warrants to purchase 189,748 shares of Common Stock, BV III KG purchased 6,414 shares of Series B and warrants to purchase 16,035 shares of Common Stock, BV III PF purchased 2,291 shares of Series B and warrants to purchase 5,728 shares of Common Stock, AM LLC purchased 1,468 shares of Series B and warrants to purchase 3,670 shares of Common Stock and MPM NVS purchased 71,638 shares of Series B and warrants to purchase 179,095 shares of Common Stock. As a result of the issuance of the Series B and the Warrants, the conversion price of the Series A-1, Series A-2 and Series A-3 automatically adjusted pursuant to the anti-dilution provisions of the Certificate of Designations of the Series A-1, Series A-2, Series A-3, Series A-4, Series A-5 and Series A-6 filed by the Company with the Secretary of State of the State of Delaware, as amended from time to time (the “Series A-1 Certificate”) which resulted in an adjustment to the applicable conversion ratios for the Series A-1, Series A-2 and Series A-3 (the “Anti-Dilution Adjustment”). After giving effect to these adjustments, each share of Series A-1, Series A-2, and Series A-3 is now convertible into 10.696269 shares of Common Stock.

The sale of the Series B Stock and Warrants to the MPM Entities described above was part of a private placement by the Issuer to a number of affiliated and unaffiliated investors (including the MPM Entities).

“Item 4. Purpose of Transaction” of the Original Schedule 13D is hereby amended by adding the following at the end thereof:

The MPM Entities agreed to purchase the Series A-1, Series A-2, Series A-3, Series B and the Warrants for investment purposes with the aim of increasing the value of their investments and the Issuer.

“Item 5. Interest in Securities of the Issuer” is hereby amended and restated in its entirety as follows:

The following information with respect to the beneficial ownership of the Common Stock by the persons filing this 13D/A is provided as of the date of this filing:

The information provided and incorporated by reference in Item 3 is hereby incorporated by reference in this Item 5.

“Item 6. Contracts, Arrangements, Understandings or Relationships with Respect to Securities of the Issuer” of the Original Schedule 13D is hereby amended and restated in its entirety as follows:

Stockholders’ Agreement

Board of Directors

Pursuant to the Third Amended and Restated Stockholders’ Agreement (the “Stockholders’ Agreement”), dated as of April 23, 2013, by and among the Issuer and those holders of the Issuer’s capital stock listed on Schedule I thereto and the Series A-1 Certificate, (i) for so long as any Series A-1 is outstanding, the holders of a majority of the shares of Series A-1 outstanding, voting as a separate class, shall have the right to elect two (2) members of the Board of Directors of the Issuer (the “Board”), (ii) the G3 Holders (as defined in the Series A-1 Certificate), voting as a separate class, have the right to elect one (1) member of the Board, which shall be an individual designated by the holders of at least 70% of the outstanding shares of Series B (the “Series B Majority”); provided, however, that in order to be eligible to vote or consent with respect to the election of such member of the Board, a G3 Holder, together with members of such holder’s Group (as defined in the Stockholders’ Agreement), must hold greater than twenty percent (20%) of the shares of Series A-1 purchased under the Series A-1 Stock Purchase Agreement (as defined in the Series A-1 Certificate) by such G3 Holder and the members of such holder’s Group and (iii) MPM Capital, voting as a separate class, shall have the right to elect one (1) member of the Board by majority vote of the shares of Series A-1 held by MPM Capital; provided that such member of the Board shall be an individual with particular expertise in the development of pharmaceutical products; and, provided, further, that in order to be eligible to vote or consent with respect to the election of such member of the Board, MPM Capital together with members of the MPM Group (as defined in the Stockholders’ Agreement) must hold greater than twenty percent (20%) of the shares of Series A-1 purchased under the Purchase Agreement by MPM Capital and the members of the MPM Group. As part of the Stockholders’ Agreement, certain of the stockholders, including the MPM entities, agreed to vote in favor of all nominations pursuant to the foregoing.

Ansbert Gadicke, one of the Listed Persons, was elected to the Board by the majority of the shares of Series A-1 outstanding and Elizabeth Stoner, a managing director of one of the MPM Entities’ affiliates, was elected to the Board by the majority of the shares of Series A-1 outstanding that are held by MPM Capital, each effective as of May 17, 2011. Also in connection with the Merger, the Issuer entered into an Indemnification Agreement with each member of its board of directors, including Ansbert Gadicke and Elizabeth Stoner.

Form S-1 Demand Registration

Subject to certain limitations, if, at any time after October 20, 2013, (i) the Issuer receives a request from holders of a majority of the Registrable Securities (which generally consists of all of the Common Stock issued or issuable upon conversion of Preferred Stock and exercise of the Warrants) then outstanding that the Issuer file a Form S-1 registration statement with respect to at least thirty percent (30%) of the Registrable Securities then outstanding or (ii) the Issuer receives a request from holders of a majority of the Registrable Senior Securities (which consists of the Common Stock issued or issuable upon conversion of the Series B, Series A-1, Series A-2 and Series A-3) that the Issuer file a Form S-1 registration statement with respect to the Registrable Senior Securities then outstanding, then the Issuer shall (1) within 20 days after the date such request is given, give notice thereof to all other holders of Registrable Securities; and (2) as soon as practicable, and in any event within 60 days after the date such request is given to the Issuer, file a Form S-1 registration statement under the Securities Act covering all Registrable Securities requested to be included by the holders of Registrable Securities.

Form S-3 Demand Registration

Subject to certain limitations, if, at any time when it is eligible to use a Form S-3 registration statement, the Issuer receives a request from holders of at least ten percent (10%) of the Registrable Securities then outstanding that the Issuer file a Form S-3 registration statement with respect to outstanding Registrable Securities of such holders having an anticipated aggregate offering price, net of selling expenses, of at least $10 million, then the Issuer shall (i) within 10 days after the date such request is given, give a notice to all other holders of Registrable Securities; and (ii) as soon as practicable, and in any event within 45 days after the date such request is given, file a Form S-3 registration statement under the Securities Act covering all Registrable Securities requested to be included in such registration by the holders of Registrable Securities.

Piggyback Registration Rights

All parties to the Stockholders’ Agreement have piggyback registration rights. Under these provisions, if the Issuer registers any securities for public sale, other than (i) a registration relating to the sale of securities to employees of the Corporation or a subsidiary pursuant to a stock option, stock purchase or similar plan; (ii) a registration relating to a Rule 145 transaction; (iii) a registration on any form that does not include substantially the same information as would be required to be included in a registration statement covering the sale of the Registrable Securities; or (iv) a registration in which the only Common Stock being registered is Common Stock issuable upon conversion of debt securities that are also being registered, these stockholders will have the right to include their shares in the registration statement, subject to customary exceptions. The underwriters of any underwritten offering will have the right to limit the number of shares having registration rights to be included in the registration statement.

Expenses of Registration

The Issuer will pay all registration expenses, other than underwriting discounts and commissions, related to any demand or piggyback registration.

Indemnification

The Stockholders’ Agreement contains customary cross-indemnification provisions, pursuant to which the Issuer is obligated to indemnify the selling stockholders in the event of material misstatements or omissions in the registration statement attributable to the Issuer, and the selling stockholders are obligated to indemnify the Issuer for material misstatements or omissions attributable to them.

Lock-up Arrangements

Pursuant to the Stockholders’ Agreement, beginning on April 23, 2013 and ending on the date of the listing of the Common Stock on a national securities exchange, the MPM Entities and all other parties subject to the Stockholders’ Agreement have agreed not to sell, assign, transfer, make a short sale of, loan, or grant any option for the purchase of, any shares of Common Stock for a price that is less than $6.142 per share (subject to proportionate and equitable adjustment upon any stock split, stock dividend, reverse stock split or similar event affecting the Common Stock that becomes effective after the date of this Agreement) or any other shares of capital stock of the Company for an effective price that is less than $6.142 per share on an as-converted to Common Stock basis (subject to proportionate and equitable adjustment upon any stock split, stock dividend, reverse stock split or similar event affecting the Common Stock that becomes effective after the date of this Agreement), except (x) with the prior written consent of the Company or (y) to a member of such Stockholder’s Group (as defined in the Stockholders’ Agreement.

Right of First Refusal

Under the terms of the Stockholders’ Agreement, the Issuer is obligated to offer the holders of the Series A-1, the Series A-2, Series A-3 and the Series B a right of first refusal with respect future equity issuances, subject to customary exceptions.

The Series A-1 Certificate and the Certificate of Designations of Series B filed with the Secretary of State of the State of Delaware (the “Series B Certificate” and together with the Series A-1 Certificate, the “Certificates of Designations”)

Voting and Dividends

The Preferred Stock entitles each holder thereof to one vote for each share of Common Stock into which such share of Preferred Stock is convertible, voting together with the Common Stock as a single class except with respect to certain amendments to the Certificate of Designations, authorization or issuance of any new class or series of senior or parity capital stock (subject to certain exceptions), any liquidation, dissolution or winding up of the Issuer and as outlined above under “Board of Directors.” Dividends accrue on the Series A-1, Series A-2, Series A-3 and Series B at the rate of 8% per annum, compounding annually and payable only when, as and if declared by the Board, in cash or additional shares of Common Stock, at the Issuer’s option, or upon liquidation, dissolution or winding up of the Issuer or an Event of Sale (as defined in the Certificates of Designations). Upon conversion of any of the Series A-1, Series A-2, Series A-3 or Series B into Common Stock, additional shares of Common Stock will be issued in respect of the accrued dividends on such shares.

Ranking

Series B. With respect to dividend rights (other than with respect to the quarterly payment of accruing dividends on the Series A-5) and rights in the event of the liquidation, dissolution or winding up of the Issuer or an Event of Sale, the Series B ranks senior to the Series A-1, Series A-2, Series A-3, Series A-4, Series A-5 and Series A-6 and the Common Stock. In the event of the liquidation, dissolution or winding up of the Issuer or an Event of Sale, the Series B holders shall be entitled to receive an amount per share equal to the sum of two times the Series B purchase price, plus any declared or accrued but unpaid dividends on such shares of Series B.

Series A-1. With respect to dividend rights (other than with respect to the quarterly payment of accruing dividends on the Series A-5) and rights in the event of the liquidation, dissolution or winding up of the Issuer or an Event of Sale. The Series A-1 ranks senior to the Series A-2, Series A-3, Series A-4, Series A-5 and Series A-6 and the Common Stock. In the event of the liquidation, dissolution or winding up of the Issuer or an Event of Sale, the Series A-1 holders shall be entitled to receive an amount per share equal to $81.42, plus any accrued and unpaid dividends on such shares of Series A-1.

Series A-2. With respect to dividend rights (other than with respect to the quarterly payment of accruing dividends on the Series A-5) and rights in the event of the liquidation, dissolution or winding up of the Issuer or an Event of Sale. The Series A-2 ranks senior to the Series A-3, Series A-4, Series A-5 and Series A-6 and the Common Stock. In the event of the liquidation, dissolution or winding up of the Issuer or an Event of Sale, the Series A-2 holders shall be entitled to receive an amount per share equal to $81.42, plus any accrued and unpaid dividends on such shares of Series A-2.

Series A-3. With respect to dividend rights (other than with respect to the quarterly payment of accruing dividends on the Series A-5) and rights in the event of the liquidation, dissolution or winding up of the Issuer or an Event of Sale. The Series A-3 ranks senior to the Series A-4, Series A-5 and Series A-6 and the Common Stock. In the event of the liquidation, dissolution or winding up of the Issuer or an Event of Sale, the Series A-3 holders shall be entitled to receive an amount per share equal to $81.42, plus any accrued and unpaid dividends on such shares of Series A-3.

Conversion

The Series B Preferred Stock is subject to automatic conversion, at the then applicable conversion ratio, into Common Stock upon (i) an election to convert made by the Series B Majority or (ii) the listing of the Common Stock on a national securities exchange.

The Preferred Stock is subject to automatic conversion, at the then applicable conversion ratio, into Common Stock upon (i) an election to convert made by holders of at least 70% of the outstanding shares of Series A-1, Series A-2 and Series A-3, voting together as a single class or (ii) the listing of the Common Stock on a national securities exchange.

The Series A-1, Series A-2, Series A-3 and Series B may also be voluntarily converted at any time, at the option of the holder, at the then applicable conversion ratio, into Common Stock.

Anti-dilution Protection

All shares of Series B shall have weighted-average anti-dilution protection (based on the initial conversion purchase price of $6.142 per share) and anti-dilution protection upon the occurrence of any subdivision or combination of the Common Stock, stock dividend and other distribution, reorganization, reclassification or similar event affecting the Common Stock, subject to certain exceptions.

All shares of Series A-1, Series A-2 and Series A-3 shall have weighted-average anti-dilution protection (based on the initial conversion purchase price of $8.142 per share) and anti-dilution protection upon the occurrence of any subdivision or combination of the Common Stock, stock dividend and other distribution, reorganization, reclassification or similar event affecting the Common Stock, subject to certain exceptions.

Warrants

The MPM Entities acquired Warrants to purchase an aggregate of 407,034 shares of Common Stock. The Warrants are exercisable through April 23, 2018 (the “Expiration Date”) at an exercise price of $6.142 per share. In addition, the Warrants are exercisable on a cashless basis (by surrender of the number of shares underlying the Warrants having a fair market value equal to the aggregate exercise price of the shares being acquired) until and including the Expiration Date. Certain rights relating to the Warrants were set forth in a warrant, dated as of April 23, 2013. The applicable per share purchase price and the number of shares issuable upon exercise of the Warrants are subject to adjustment for the occurrence of certain events, including stock dividends, splits, subdivisions, combinations, reorganizations and reclassifications.

The foregoing description contained in this Item 6 of the terms of the Stockholders’ Agreement, the Certificates of Designations and the Warrants are intended as a summary only and are qualified in their entirety by reference to the full text of the Stockholders’ Agreement, the Certificates of Designations, and the Warrants, which are filed as exhibits to this Schedule 13D and incorporated herein by reference.

The information provided and incorporated by reference in Items 3, 4 and 5 is hereby incorporated by reference herein. Other than as described in this Schedule 13D, to the best of the MPM Entities’ and Listed Persons’ knowledge, there are no other contracts, arrangements, understandings or relationships (legal or otherwise) among the persons named in Item 2 and between such persons and any person with respect to any securities of the Issuer.

SIGNATURES

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Dated: May 7, 2013

The original statement shall be signed by each person on whose behalf the statement is filed or his authorized representative. If the statement is signed on behalf of a person by his authorized representative (other than an executive officer or general partner of the filing person), evidence of the representative’s authority to sign on behalf of such person shall be filed with the statement: provided, however, that a power of attorney for this purpose which is already on file with the Commission may be incorporated by reference. The name and any title of each person who signs the statement shall be typed or printed beneath his signature.

Attention: Intentional misstatements or omissions of fact

constitute Federal criminal violations (See 18 U.S.C. 1001)

SCHEDULE I

General Partners/Members:

Luke Evnin

c/o MPM Asset Management

The John Hancock Tower

200 Clarendon Street, 54^4h Floor

Boston, Massachusetts 02116

Principal Occupation: Series A member of the general partner of the general partner of MPM BioVentures III-QP, L.P., MPM BioVentures III, L.P., MPM BioVentures III Parallel Fund, L.P. and MPM BioVentures III GmbH & Co. Beteiligungs KG, manager of MPM Asset Management Investors 2003 BVIII LLC and a member of the managing member of the general partner of MPM Bio IV NVS Strategic Fund

Citizenship: USA

Ansbert Gadicke

c/o MPM Asset Management

The John Hancock Tower

200 Clarendon Street, 54^4h Floor

Boston, Massachusetts 02116

Principal Occupation: Series A member of the general partner of the general partner of MPM BioVentures III-QP, L.P., MPM BioVentures III, L.P., MPM BioVentures III Parallel Fund, L.P. and MPM BioVentures III GmbH & Co. Beteiligungs KG, manager of MPM Asset Management Investors 2003 BVIII LLC and a member of the managing member of the general partner of MPM Bio IV NVS Strategic Fund

Citizenship: USA

Nicholas Galakatos

c/o MPM Asset Management

The John Hancock Tower

200 Clarendon Street, 54^4h Floor

Boston, Massachusetts 02116

Principal Occupation: Series A member of the general partner of the general partner of MPM BioVentures III-QP, L.P., MPM BioVentures III, L.P., MPM BioVentures III Parallel Fund, L.P. and MPM BioVentures III GmbH & Co. Beteiligungs KG and manager of MPM Asset Management Investors 2003 BVIII LLC

Citizenship: USA

Michael Steinmetz

c/o MPM Asset Management

The John Hancock Tower

200 Clarendon Street, 54^4h Floor

Boston, Massachusetts 02116

Principal Occupation: Series A member of the general partner of the general partner of MPM BioVentures III-QP, L.P., MPM BioVentures III, L.P., MPM BioVentures III Parallel Fund, L.P. and MPM BioVentures III GmbH & Co. Beteiligungs KG and manager of MPM Asset Management Investors 2003 BVIII LLC

Citizenship: USA

Kurt Wheeler

c/o MPM Asset Management

The John Hancock Tower

200 Clarendon Street, 54^4h Floor

Boston, Massachusetts 02116

Principal Occupation: Series A member of the general partner of the general partner of MPM BioVentures III-QP, L.P., MPM BioVentures III, L.P., MPM BioVentures III Parallel Fund, L.P. and MPM BioVentures III GmbH & Co. Beteiligungs KG and manager of MPM Asset Management Investors 2003 BVIII LLC

Citizenship: USA

Nicholas Simon III

c/o MPM Asset Management

The John Hancock Tower

200 Clarendon Street, 54^4h Floor

Boston, Massachusetts 02116

Principal Occupation: Series A member of the general partner of the general partner of MPM BioVentures III-QP, L.P., MPM BioVentures III, L.P., MPM BioVentures III Parallel Fund, L.P. and MPM BioVentures III GmbH & Co. Beteiligungs KG and manager of MPM Asset Management Investors 2003 BVIII LLC

Citizenship: USA

Dennis Henner

c/o MPM Asset Management

The John Hancock Tower

200 Clarendon Street, 54^4h Floor

Boston, Massachusetts 02116

Principal Occupation: Series A member of the general partner of the general partner of MPM BioVentures III-QP, L.P., MPM BioVentures III, L.P., MPM BioVentures III Parallel Fund, L.P. and MPM BioVentures III GmbH & Co. Beteiligungs KG and manager of MPM Asset Management Investors 2003 BVIII LLC

Citizenship: USA

James Paul Scopa

c/o MPM Asset Management

601 Gateway Blvd. Suite 350

S. San Francisco, CA 94080

Principal Occupation: Member of the managing member of the general partner of MPM Bio IV NVS Strategic Fund

Citizenship: USA

Todd Foley

c/o MPM Asset Management

The John Hancock Tower

200 Clarendon Street, 54^th Floor

Boston, MA 02116

Principal Occupation: Member of the managing member of the general partner of MPM Bio IV NVS Strategic Fund

Citizenship: USA

Vaughn M. Kailian

c/o MPM Asset Management

The John Hancock Tower

200 Clarendon Street, 54^th Floor

Boston, MA 02116

Principal Occupation: Member of the managing member of the general partner of MPM Bio IV NVS Strategic Fund

Citizenship: USA

John Vander Vort

c/o MPM Asset Management

The John Hancock Tower

200 Clarendon Street, 54^th Floor

Boston, MA 02116

Principal Occupation: Member of the managing member of the general partner of MPM Bio IV NVS Strategic Fund

Citizenship: USA

EXHIBIT INDEX

Exhibit F

JOINT FILING STATEMENT

I, the undersigned, hereby express my agreement that the attached Schedule 13D (and any amendments thereto) relating to the Common Stock of Radius Health, Inc. is filed on behalf of each of the undersigned.

Dated: May 7, 2013