Two testosterone support formulas, one with ashwagandha and one without. The Trusted Health Reviews editorial team compares them.
✍️ By the Trusted Health Reviews editors✅ Products compared side by side📅 Updated for 2026
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In briefChecked October 2026
For testosterone support, Testosil comes first in our ranking, while TestRX is best for a zinc + magnesium (ZMA) formula. Both list all of their doses and both use D-aspartic acid. Testosil includes KSM-66 ashwagandha, and a single serving reaches the upper limits for zinc and vitamin D. TestRX has moderate zinc and vitamin D and no ashwagandha. Neither has a clinical trial of its own.
⚡ The short verdict
Testosil is our choice, as our top pick among testosterone-support formulas. The main reason is KSM-66 ashwagandha, which has the most testosterone data of any ingredient on either label. Men who want to avoid ashwagandha may like TestRX, but an independent study found that ZMA didn't raise testosterone.
Testosil, from Leading Edge Health, is a 4-capsule testosterone support formula. Its core is D-aspartic acid (2,000 mg) with KSM-66 ashwagandha (300 mg per serving). Zinc, vitamin D, ginseng, fenugreek and other ingredients complete it. Doses are all disclosed, and a third-party lab certificate found no hidden drugs. Still, the product has never had a clinical trial. One serving takes you to the adult upper limits for zinc and vitamin D. The refund policy has no time limit, but it covers only unopened bottles and one opened bottle.
TestRX is a 4-capsule product. We couldn't confirm its label on the official site, but a third-party listing gives D-aspartic acid (2,300 mg), fenugreek (300 mg), magnesium, zinc (10 mg), vitamin B6 and vitamins D3 and K2. It contains no ashwagandha and has no trial of its own. In an independent study, ZMA-style zinc and magnesium failed to raise testosterone. The brand advertises a 67-day guarantee (terms not confirmed).
Testosil is our top pick for testosterone support and the winner here. It lacks a trial of its own, so keep your expectations modest and order from the official site so its refund policy applies.
We pick Testosil in this comparison, and it is our top pick among testosterone-support formulas. TestRX is best for a zinc + magnesium (ZMA) formula. Neither has a clinical trial of its own.
Both formulas contain D-aspartic acid, fenugreek, zinc and vitamin D. Testosil goes further with KSM-66 ashwagandha, ginseng, L-arginine and more, and has higher zinc and vitamin D. TestRX brings in magnesium and vitamin K2 instead and has no ashwagandha.
The two overlap on D-aspartic acid, fenugreek, zinc and vitamin D. Using both doubles up those ingredients and pushes zinc and vitamin D beyond adult upper limits. Choose one of them.
Order Testosil from the official website. The guarantee has no time limit. Refunds cover unopened bottles plus one opened bottle, shipping is excluded and each customer is limited to one order. The wording on the guarantee page doesn't always agree with itself, so check with customer service before returning.
Both are dietary supplements. Neither is a treatment for low testosterone, and men with symptoms should get tested. Testosil: ashwagandha has been tied to rare liver injury and may raise thyroid hormone levels; several ingredients can interact with diabetes, blood pressure, sedative and blood-thinning medicines; and a single serving hits the adult upper limits for zinc and vitamin D. TestRX: fenugreek may upset the stomach, sometimes provoke allergic reactions and lower blood sugar, so be careful with diabetes medicines. The zinc in it can reduce absorption of some antibiotics.
Disclaimer: The Trusted Health Reviews editorial team produced this comparison. Every product mentioned is a dietary supplement, not a medicine. Not intended to diagnose, treat, cure or prevent any disease. These statements have not been evaluated by the Food and Drug Administration. Results may differ between people. Please speak with a qualified healthcare professional before you begin any supplement program. We earn affiliate commissions when you buy through links on this page, at no extra cost to you. Read the full disclaimer
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