Exhibit 99.1

Mannatech Reports Financial Results for First Quarter 2026

(Flower Mound, Texas) May 14, 2026 - Mannatech, Incorporated (NASDAQ: MTEX), ("Mannatech" or "Company"), global health and wellness company committed to transforming lives to make a better world, today announced financial results for its first quarter of 2026.

First Quarter Results

Management's Statement

Changes in current trade policies, including with respect to tariffs, could affect our cost structure and profitability. While we take steps to mitigate or avoid these increased costs and disruptions, our ability to do so may be limited by operational and supply chain constraints and uncertainties, especially in the short term.

Non-GAAP Financial Measures

In addition to results presented in accordance with GAAP, this press release and related tables include certain non-GAAP financial measures, including a presentation of Constant dollar measures. The company discloses operating results that have been adjusted to exclude the impact of changes due to the translation of foreign currencies into U.S. dollars, including changes in: Net Sales, Gross Profit, and Loss from Operations.

The Company believes that these non-GAAP financial measures provide useful information to investors because they are an indicator of the strength and performance of ongoing business operations. The constant currency figures are financial measures used by management to provide investors with an additional perspective on trends. Although management believes the non-GAAP financial measures enhance investors’ understanding of their business and performance, these non-GAAP financial measures should not be considered an exclusive alternative to accompanying GAAP financial measures. Please see the accompanying table entitled "Non-GAAP Financial Measures" for a reconciliation of these non-GAAP financial measures.

Safe Harbor statement

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,” “will,” “should,” "hope," “could,” “would,” “expects,” “plans,” “intends,” “anticipates,” “believes,” “estimates,” “approximates,” “predicts,” “projects,” “potential,” and “continues” 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 United States 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 the expectations, statements, and assumptions reflected in these forward-looking statements are reasonable, it cautions 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 United States 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.

^ Mannatech operates in China under a cross-border e-commerce platform that is separate from its network marketing model.

Individuals interested in Mannatech's products or in exploring its business opportunity can learn more at Mannatech.com.

Contact Information:

Erin K. Barta

General Counsel and Corporate Secretary

214-724-3378

ir@mannatech.com

www.mannatech.com

MANNATECH, INCORPORATED AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS - (UNAUDITED)

(in thousands, except share and per share information)

MANNATECH, INCORPORATED AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - (UNAUDITED)

(in thousands, except per share information)

Net sales by region for the three months ended March 31, 2026 and 2025 were as follows (in millions, except percentages):

Non-GAAP Financial Measures (Sales, Gross Profit and Loss from Operations in Constant Dollars)

To supplement its financial results presented in accordance with generally accepted accounting principles in the United States (“GAAP”), Mannatech discloses operating results that have been adjusted to exclude the impact of changes due to the translation of foreign currencies into U.S. dollars, including changes in: Net Sales, Gross Profit, and Loss from Operations. It refers to these adjusted financial measures as Constant dollar items, which are non-GAAP financial measures. The company believes these measures provide investors with an additional perspective on trends. To exclude the impact of changes due to the translation of foreign currencies into U.S. dollars, it calculates current year results and prior year results at a constant exchange rate, which is the prior year’s rate. Currency impact is determined as the difference between the actual GAAP results and the recalculated results for the current year at the Constant dollar rates.

The tables below reconcile first quarter 2026 Constant dollar net sales, gross profit and loss from operations to GAAP net sales, gross profit and loss from operations. (in millions, except percentages):