Short answer: 11 active ingredients, led by 600mg of KSM-66 Ashwagandha, which is the equivalent of roughly 3,600mg of ordinary ashwagandha powder. AstraGin is included to improve absorption of the rest.
| Ingredient | What it is for | Evidence |
|---|---|---|
| KSM-66 Ashwagandha | The core of the formula. Raises testosterone and lowers cortisol. The ingredient behind the 434% figure.* | Strong |
| Fenugreek | Libido and body composition support | Moderate |
| D-Aspartic Acid | Amino acid involved in testosterone production | Mixed |
| Zinc | A deficiency directly suppresses testosterone | Strong if deficient |
| Magnesium | Supports free testosterone and sleep quality | Moderate |
| Vitamin B6 | Completes the ZMA stack with zinc and magnesium | Supporting |
| Vitamin D3 | Low levels are strongly linked to low testosterone | Strong if deficient |
| L-Arginine HCL | Blood flow and pumps during training | Moderate |
| Panax Ginseng | Energy, stamina and mental focus | Moderate |
| Allium Sativa (Garlic) | Circulation support | Supporting |
| AstraGin | Patented absorption enhancer, improves uptake of the others | Supporting |
Plenty of testosterone formulas list ashwagandha. The number that matters is how much, and which extract.
Equivalent to roughly 3,600mg of ordinary ashwagandha root powder, because KSM-66 is a concentrated standardized extract rather than ground root.
The research used 300mg twice daily. That is why the label is built around two servings instead of a single capsule.
KSM-66 is the most studied ashwagandha extract available, with over 14 years of development behind it.
A US patented absorption enhancer tested in 16 in vitro and 8 in vivo studies, so the formula is absorbed rather than passed through.
Two servings daily. The clinical dosing is equivalent to two servings, so a single serving does not match the research. Splitting them morning and evening, with food, is the approach that avoids the mild stomach effects some people get from zinc and magnesium, and it puts the ashwagandha closer to bedtime where its calming effect works in your favor.
See the Full LabelPricing and guarantee set by the manufacturer
Testosil contains 11 active ingredients: KSM-66 Ashwagandha, fenugreek, D-aspartic acid, zinc, magnesium, vitamin B6, vitamin D3, L-arginine HCL, panax ginseng, garlic extract and AstraGin. KSM-66 Ashwagandha is the lead ingredient at 600mg, and AstraGin is included to improve absorption of the rest.
600mg, which the manufacturer states is equivalent to roughly 3,600mg of ordinary ashwagandha root powder. The clinical study used 300mg twice daily, matching the two serving structure of the label.
AstraGin is a US patented absorption enhancer combining astragalus and panax notoginseng, tested in 16 in vitro and 8 in vivo studies. It is included so that the other ingredients are absorbed rather than passing through unused.
Two servings daily. The clinical dosing used in the research is equivalent to two servings, which is why the formula is structured that way rather than as a single daily capsule.
Testosil does not use caffeine or similar stimulants. Panax ginseng supports energy and focus without acting as a stimulant in that sense, and ashwagandha works in the opposite direction by lowering cortisol.
Testosil: the full formula and the clinical study · What the evidence shows · Side effects · How it compares
Daily Gear Digest covers supplements and performance products for men. Figures come from the clinical research the manufacturer cites and from the product label, with study conditions stated so you can judge them yourself. We earn a commission when you buy through our links, and we are not the manufacturer or seller of this product.
* In a clinical study of one ingredient, men taking that ingredient alongside exercise experienced a 434% greater increase in testosterone compared to men who exercised with a placebo, at a dosage equivalent to two servings of Testosil.
Medical disclaimer. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This page is for information only and is not medical advice. Consult a qualified healthcare provider before starting any supplement.
Affiliate disclaimer. This site earns commissions on qualifying purchases made through links on this page, at no additional cost to you. We do not set pricing, shipping terms or guarantee terms.
Results disclaimer. Individual results vary. Study figures describe group averages under specific conditions including supervised resistance training, and are not a prediction of individual results.