Exhibit 99.1

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k)(1)(iii) under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them of a Statement on Schedule 13D (including additional amendments thereto) with respect to the common stock, no par value per share, of Rockwell Medical, Inc., a Michigan corporation. This Joint Filing Agreement shall be filed as an Exhibit to such Statement.

Dated: March 28, 2019

Richmond Brothers, Inc.
By:	/s/ David S. Richmond
	Name:	David S. Richmond
	Title:	Chairman

RBI Private Investment I, LLC
By:	RBI PI Manager, LLC
	Manager
By:	/s/ David S. Richmond
	Name:	David S. Richmond
	Title:	Manager

RBI Private Investment II, LLC
By:	RBI PI Manager, LLC
	Manager
By:	/s/ David S. Richmond
	Name:	David S. Richmond
	Title:	Manager

The RBI Opportunities Fund, LLC
By:	RBI PI Manager, LLC
	Manager
By:	/s/ David S. Richmond
	Name:	David S. Richmond
	Title:	Manager

The RBI Opportunities Fund II, LLC
By:	RBI PI Manager, LLC
	Manager
By:	/s/ David S. Richmond
	Name:	David S. Richmond
	Title:	Manager

By:	RBI PI Manager, LLC
By:	/s/ David S. Richmond
	Name:	David S. Richmond
	Title:	Manager

By:	Richmond Brothers 401(k) Profit Sharing Plan
By:	/s/ David S. Richmond
	Name:	David S. Richmond
	Title:	Trustee

/s/ David S. Richmond

David S. Richmond

/s/ Matthew J. Curfman

Matthew J. Curfman