Exhibit 99.1

Mannatech Announces Record Quarterly Sales, Net Income and E.P.S

Coppell, Texas–August 10, 2004 - Mannatech, Incorporated (NASDAQ: MTEX) today announced record sales and net income for its second quarter ended June 30, 2004. For the three months ended June 30, 2004, net sales reached $74.3 million, which was an increase of 59.8% from $46.5 million for the same period in 2003 and net income increased by 376.1% to $5.6 million or $0.20 earnings per share (diluted), as compared to $1.2 million or $0.04 earnings per share (diluted) for the same period in 2003. For the first six months of 2004, net sales increased by 52.5% to reach $132.7 million and net income increased to $8.7 million, or $0.32 earnings per share (diluted), compared to sales of $87.0 million and net income of $2.6 million, or $0.10 earnings per share (diluted) for the same period in 2003. Net sales by country for the three months ended June 30, 2004, in millions, and as a percentage of total net sales are as follows:

	United States				Canada				Australia				United Kingdom				Japan				New Zealand				Total
2004	$	49.5	66.6	%	$	5.8	7.8	%	$	7.4	10.0	%	$	2.6	3.5	%	$	5.9	7.9	%	$	3.1	4.2	%	$	74.3	100	%
2003	$	31.7	68.2	%	$	4.2	9.0	%	$	3.4	7.3	%	$	1.0	2.2	%	$	4.6	9.9	%	$	1.6	3.4	%	$	46.5	100	%
% increase 2004 over 2003		56.2%				38.1%				117.6%				160.0%				28.3%				93.8%				59.8%

Commenting on the results, Mannatech Chairman and CEO Sam Caster said, “Our record performance, with sales growth of 59.8% and net income increasing 376.1%, is a testament to Mannatech’s products, our Associates and the future of the Company. Along with this tremendous growth in our current markets, we are excited about introducing Mannatech products to South Korea when we plan to open for business in September 2004. Another sign of our strong trend is our increase in pack sales, which increased by 101.8% in the second quarter of 2004 as compared to 2003. Pack sales, which are regarded as a leading indicator for Mannatech, include signups, renewals, and upgrades, and our higher priced pack choices include various product selections as well as sales materials. New Associates are joining our company at a record rate, and we look forward to adding South Korea to our family of markets.”

The number of new and continuing Mannatech independent associates and members who purchased Mannatech’s products within the last 12 months is as follows:

	For the twelve months ended June 30,
	2003			2004
New	112,000	49.6	%	150,000	47.8	%
Continuing	114,000	50.4	%	164,000	52.2	%
Total	226,000	100.0	%	314,000	100.0	%

About Mannatech, Incorporated

Mannatech, based in Coppell, Texas, is a wellness solution provider that sells its products through a global network-marketing system throughout the United States and the international markets of Canada, Australia, the United Kingdom, Japan and New Zealand. Mannatech plans to open operations in South Korea in September 2004 and in Taiwan in the first quarter of 2005. For additional information about Mannatech, please visit its corporate website: www.mannatech.com.

Please Note: This release contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, Section 21E of the Securities Exchange Act of 1934, as amended, and the Private Securities Litigation Reform Act of 1995. These forward-looking statements generally can be identified by use of phrases or terminology such as “may,” “believes,” and “plans” or other similar words or the negative of such terminology. Similarly, descriptions of Mannatech’s objectives, strategies, plans, goals or targets contained herein are also considered forward-looking statements. Mannatech believes this release should be read in conjunction with all of its filings with the Securities and Exchange Commission and cautions its readers that these forward-looking statements are subject to certain events, risks, uncertainties, and other factors. Some of these factors include, among others, Mannatech’s inability to attract and retain associates and members, increases in competition, litigation, regulatory changes, and its planned growth into new international markets. Although Mannatech believes that its expectations, statements, and assumptions reflected in these forward-looking statements are reasonable, it cautions its readers to always consider all of the risk factors and any other cautionary statements carefully in evaluating each forward-looking statement in this release, as well as those set forth in its latest Annual Report on Form 10-K, and other filings filed with the Securities and Exchange Commission, including its current reports on Form 8-K. All of the forward-looking statements contained herein speak only as of the date of this release.

(Unaudited financial schedules to follow)

Contact:

Mannatech, Incorporated

Stephen Fenstermacher, CFO

972-471-6512

IR@mannatech.com

MANNATECH, INCORPORATED

CONSOLIDATED BALANCE SHEETS (UNAUDITED)

(in thousands, except share amounts)

	December 31, 2003			June 30, 2004
ASSETS
Cash and cash equivalents	$	28,291		$	35,041
Restricted cash		2,140			393
Accounts receivable		134			460
Current portion of notes receivable from shareholders		55			—
Inventories		7,861			9,134
Prepaid expenses and other current assets		2,084			1,475
Deferred tax assets		2,363			2,336
Total current assets		42,928			48,839
Property and equipment, net		5,514			5,772
Long-term investments		9,994			17,065
Notes receivable from shareholders, excluding current portion		150			155
Deferred tax assets		631			644
Restricted cash		—			549
Other assets		806			1,377
Total assets	$	60,023		$	74,401
LIABILITIES AND SHAREHOLDERS’ EQUITY
Current portion of capital leases and notes payable	$	16		$	10
Accounts payable		2,687			2,301
Accrued expenses		19,940			27,291
Deferred revenue		3,142			4,400
Current portion of accrued severance related to former executives		953			486
Total current liabilities		26,738			34,488
Capital leases and notes payable, excluding current portion		32			28
Accrued severance related to former executives, excluding current portion		359			169
Long-term liabilities		106			405
Deferred tax liabilities		—			12
Total liabilities		27,235			35,102
Commitments and contingencies		—			—
Shareholders’ equity:
Preferred stock, $0.01 par value, 1,000,000 shares authorized, no shares Issued and outstanding		—			—
Common stock, $0.0001 par value, 99,000,000 shares authorized, 26,227,171 shares issued and 26,183,422 outstanding in 2003 and 26,425,671 shares issued and 26,351,356 outstanding in 2004		3			3
Additional paid-in capital		24,175			25,030
Retained earnings		9,271			15,327
Accumulated other comprehensive loss		(422	)		(499	)
		33,027			39,861
Less treasury stock, at cost, 43,749 shares in 2003 and 74,315 in 2004		(239	)		(562	)
Total shareholders’ equity		32,788			39,299
Total liabilities and shareholders’ equity	$	60,023		$	74,401

MANNATECH, INCORPORATED

CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED)

(in thousands, except per share information)

	Three months ended June 30,						Six months ended June 30,
	2003			2004			2003			2004
Net sales	$	46,519		$	74,318		$	86,989		$	132,705
Cost of sales		7,397			11,283			14,094			19,940
Commissions and incentives		19,590			34,139			35,932			60,005
		26,987			45,422			50,026			79,945
Gross profit		19,532			28,896			36,963			52,760
Operating expenses:
Selling and administrative expenses		9,267			11,526			19,097			23,831
Other operating costs		7,162			8,342			12,886			15,326
Severance expenses		1,417			—			1,417			—
Total operating expenses		17,846			19,868			33,400			39,157
Income from operations		1,686			9,028			3,563			13,603
Interest income		58			155			134			293
Interest expense		(2	)		(15	)		(4	)		(16	)
Other income (expense), net		(104	)		(755	)		8			(847	)
Income before income taxes		1,638			8,413			3,701			13,033
Income taxes		(467	)		(2,839	)		(1,111	)		(4,354	)
Net income	$	1,171		$	5,574		$	2,590		$	8,679
Earnings per common share:
Basic	$	0.05		$	0.21		$	0.10		$	0.33
Diluted	$	0.04		$	0.20		$	0.10		$	0.32
Weighted-average common shares outstanding:
Basic		25,179			26,343			25,156			26,289
Diluted		26,526			27,389			26,618			27,380