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TestRX Review: Does This ZMA Formula Raise Testosterone?
Trusted Health Reviews editors · October 2026
TestRX Review: Does This ZMA Formula Raise Testosterone?
TestRX blends D-aspartic acid, fenugreek, zinc, magnesium and vitamins D3 and K2, without ashwagandha. We check the ZMA research, the doses and who it might suit.
In briefChecked October 2026
Probably not much, based on current evidence. A 4-capsule serving of TestRX contains D-aspartic acid 2,300 mg, fenugreek 300 mg, zinc 10 mg, magnesium, vitamin B6 and vitamins D3 and K2, and each dose is disclosed. It has no ashwagandha. Weak or negative evidence surrounds the main ingredients for raising testosterone, and the product has never been tested.
The ZMA angle
The pitch for TestRX is built on ZMA, which combines zinc, magnesium and vitamin B6. That idea began with a small 2000 study of college football players (Brilla and Conte) reporting higher testosterone. When an independent study later tested ZMA in 14 healthy exercising men, total and free testosterone didn't change. At 10 mg, the zinc in TestRX is also well below that in the ZMA products studied. Zinc helps chiefly when someone is deficient.
D-aspartic acid, 2,300 mg: a dose of 3 g a day did nothing for testosterone in trained men (Melville, 2015).
Fenugreek seed extract, 300 mg: the one maker-funded trial, in men aged 43 to 70, used a different extract at 600 mg a day.
Vitamin D3 at 1,140 IU and vitamin K2 at 20 mcg: vitamin D matters mostly for people who are low.
Magnesium at 200 mg, with vitamin B6 at 5 mg.
A third-party review of the label (September 2026) is the source of these amounts, and we couldn't confirm them on the official site. The current label we found lists no KSM-66 ashwagandha.
Who it could suit
A man who prefers a simple formula with every dose disclosed, no ashwagandha and moderate zinc and vitamin D might find TestRX a fit. Suspect low testosterone? Get a blood test first, because supplements aren't a treatment for it. Our piece on testosterone boosters vs TRT explains the difference.
TestRX has no trial of its own, and the evidence for its main ingredients on raising testosterone is weak or negative. The independent ZMA study found testosterone unchanged, and D-aspartic acid failed in trained men.
Testosil is our top pick among testosterone-support formulas and has 300 mg of KSM-66 ashwagandha per serving. TestRX has no ashwagandha. As finished products, neither has been tested.
A timeline can't be drawn from product data, since there's no trial. Testosterone supplement studies mostly ran 8 to 12 weeks. Reports put the guarantee at 67 days from delivery, with conditions. Assuming it applies, you should decide by about day 55 so returns arrive within 67 days of delivery.
Fenugreek may upset the stomach, cause rare allergic reactions and lower blood sugar, so be careful if you take diabetes medicines. Zinc may reduce how well some antibiotics are absorbed. Add up zinc and vitamin D from any other supplements. It isn't for anyone under 18.
ZMA stands for a mix of zinc, magnesium and vitamin B6. In TestRX, zinc comes as monomethionine (10 mg), magnesium as aspartate (200 mg), and vitamin B6 adds 5 mg.
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