Short answer: customer feedback centers on energy, training performance and sleep. The clinical research behind the key ingredient measured a testosterone increase of 96.2 ng/dL over 8 weeks, against 18.0 ng/dL for training alone.
Reviews published by the manufacturer.
"I started using Testosil 6 months ago and I'm very happy with it. I was tired a lot. Energy level is way up. I gained back muscle mass and I'm sleeping much better."
Frank P., 68"My energy at the gym rivals the energy and power I had in my 20s. I'm lifting more than I did back then and I no longer need afternoon naps."
Nathan S., 47"Testosil has been great. More energy at the gym and my muscles are growing again."
Hassan L."My levels went up about 300 points. I started to notice differences in my physique. Really good product and it definitely works."
Joe P.Individual results vary. These are not typical results and are not a guarantee of outcome.
The most common thing reported, and usually the earliest. It shows up before any change in the mirror.
Lifting more, recovering faster, wanting to train again. Consistent with a formula designed to work alongside exercise.
Mentioned often, and expected: ashwagandha lowers cortisol, which is why some users move the second serving to the evening.
Reports describe change over months rather than the first week. The study itself ran 8 weeks.
Customer feedback is one kind of evidence. The other is the clinical research behind the key ingredient, and it is more specific.
| Group | Testosterone change over 8 weeks |
|---|---|
| Resistance training plus the key ingredient | +96.2 ng/dL |
| Resistance training plus placebo | +18.0 ng/dL |
57 men aged 18 to 50, double blind and placebo controlled, with the difference statistically significant at p=0.004. The supplemented group's increase was 434% greater than the increase training produced on its own.*
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The pattern across both the research and the customer feedback points the same way. Testosil is built for men who are already training and want the training to produce more. Both groups in the study exercised for the full 8 weeks, so the formula is designed to amplify effort rather than replace it.
If you train consistently and give it the 8 week window the research used, you are using it the way it was tested.
Customer reviews published by the manufacturer consistently mention more energy, better training performance and improved sleep, generally over weeks rather than days. Individual results vary and these are not typical results. The clinical research behind the key ingredient measured a 96.2 ng/dL testosterone increase over 8 weeks, compared with 18.0 ng/dL for training alone.
The clinical study ran 8 weeks with participants training throughout. Customer reports often mention energy changes earlier than that, but the research timeline is 8 weeks, which is why the 90 day supply is the common choice.
It depends on whether you train. The formula uses KSM-66 ashwagandha at the dose used in published research, which is more than most competing products do. In the study, both groups exercised, so the value comes from amplifying training that is already happening.
The manufacturer reports no negative side effects. Where customers mention anything, it tends to be calmness or improved sleep from the ashwagandha, which many treat as a benefit.
In the study behind the 434% figure, both the supplement group and the placebo group did resistance training for all 8 weeks. The formula is built to work alongside training.
Testosil: the full formula and the clinical study · Side effects and who should check with a doctor · Where to buy it · Does it work? · Compared to TestoPrime · Ingredients
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, particularly if you take prescription medication or have a medical condition.
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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.