• Same Great Formula With 15% More – Now a 30-Day Supply
  • With Somatrin™ Growth Factors
  • Clinical Studies Showing Increased Free Testosterone
  • Contains an Exclusive Anti-Estrogen Complex


10 reviews


ISA-TEST GF is a precise combination of natural ingredients clinically shown to cause increases in testosterone and a reduction in the “female-hormone” estrogen.ⱡ It’s designed to promote noticeable gains in strength, increased muscle mass, and improved sexual drive and performance.∆

What does BIO-GRO do?


Promotes healthy body composition, while supporting healthy testosterone levels without banned substances, illegal ingredients, or nasty side effects.∆


Increases work efficiency under stressful conditions, improving athletic performance, strength, and promoting recovery after intense muscular workloads.∆ⱡ


Confirmed in research studies, it demonstrates strong androgenic and anabolic properties to boost libido and increase muscle mass. Class-leading ingredients in ISA-TEST GF have been included to help increase performance and libido. Epimedium, also known as “horny goat weed” has a long standing tradition of helping decrease feelings of fatigue and improving sex drive. ∆

Frequently Asked Questions

With the guidance of a leading pharmaceutical specialist and medical doctor, iSatori developed an exclusive Rapid Bio-Diffusion Delivery™ technology, which uses a sophisticated “micro-particlization” process, so it starts working from the very first dose to help the body’s natural testosterone production.∆ⱡ Within 30 minutes of taking this supplement, you’ll begin to “feel” it going to work… an instant rush of testosterone… because of its fast absorption and increased potency.∆ⱡ No other testosterone formula contains this state-of-the-art delivery technology. You can find it only in ISA-TEST products.
The efficacy of its incredible testosterone-enhancing and estrogen-reducing effects were scientifically documented by researchers Rob Mendel, PhD, and Dr. Tim Ziegenfuss of the Ohio Research Group of Exercise Science and Sports Nutrition! The conclusion of the study, after just three weeks (and it works on a progressive basis), Free or usable testosterone levels increased by up to 154%, and estrogen levels decreased by up to 43%. Equally important, all of the subjects’ health markers (e.g., liver, kidney, cholesterol, blood pressure, etc.) were normal and healthy. So, we know, without a reason of a doubt, it works fast and is safe.∆
Take a full dose (four capsules) 60 minutes before weight training. On non-training days, take one full dose before bedtime to optimize the restorative effects of testosterone while sleeping.
“Loading” or “cycling” is not necessary. And because it is an herbal-based supplement and it won’t shut down your body’s own production of testosterone, you don’t need to cycle it and can use it for extended periods of time.∆ It is, however, always a good idea to take a break for one to two weeks, after using any kind of supplement after 12 weeks.
While estrogen does have important functional roles in men (such as maintaining bone and cardiovascular health), in excess, estrogen can promote water retention, increase bodyfat, and cause gynecomastia; that is, the female-like increase in breast tissue. This is particularly true in men who are already overweight and/or have elevated blood sugar levels. Some research even indicates increasing levels of environmentally produced, synthetic estrogens (called xenoestrogens) have the potential to disrupt the delicate endocrine system in men, potentially reducing sperm counts and increasing the risk of testicular cancer. The goal with this product is to keep estrogen at levels that optimize health and body composition.∆ⱡ
Although ISA-TEST GF has been designed as a standalone supplement, there are three other supplements you can take to magnify its health benefits. First and foremost is BIO-GRO™, which compliments elevated te4stosterone with key bio-active peptides including growth factors. Second is protein such as 100% BIO-ACTIVE WHEY before and after training. And third is a high-quality creatine like CREATINE A5X™ ideally taken within minutes after each training session.
  • Ang, H.H., and Lee, K.L., “Effect of Eurycoma longifolia Jack on Orientation Activities in Middle-Aged Male Rats,” Fundam Clin Pharmacol 16.6 (2002) : 479-83.
  • Ang, H.H., Sim M.K., “Eurycoma longifolia Jack Enhances Libido in Sexually Experienced Male Rats,” Exp Anim 46.4 (1997): 287-90.
  • Annewieke, W., “Measures of Bioavailable Serum Testosterone and Estradiol and Their Relationships with Muscle Strength, Bone Density, and Body Composition in Elderly Men,” J Clin Endocrinol Metab 85 (2000): 3276-82.
  • Gauthaman, K., et al., “Aphrodisiac Properties of Tribulus Terrestris Extract (Protodioscin) in Normal and Castrated Rats,” Life Sci 71.12 (2002): 1385-96.
  • Meeking, DR, et al., “Exercise-induced GH secretion is enhanced by the oral ingestion of melatonin in healthy adult male subjects,” Eur J Endocrinol. 1999 Jul;141(1):22-6.

Reviews (10)

Posted by Timmy on March 19, 2019

Fantastic product, great brand

Unbelievably effective, and natural. Rapid, noticeable increase in energy and strength, better mood and libido.

Posted by Eddie on February 6, 2019

Works pretty well...all those ingredients, one of them have to work!

Not Bad!…notice a difference

Posted by Lady Raven RAVE! on September 3, 2018


By husband lives by this and say it really works for him as he starts to feel engerized immediately. Good for working out or long night at work.

Posted by Amazon Shopper on July 26, 2018

Five Stars


Posted by Jim Moore on June 21, 2018

New bottle, not sure it's the same product....

New packaging and I suspect that it’s a different formula…. I’ve taken ISA-test for four years and this is the first from the new bottle design. Didn’t have the same effect on me as it usually does.

Posted by Phil B on February 27, 2018

Noticeable Difference in my Workout Results

Recommended by my personal trainer/coach. I’ve been using this product for the last 3 years whenever I need to prepare for a competition. I do notice a positive difference in my energy levels and stamina during my workouts.

Posted by Alan Potaklan on December 18, 2017

Five Stars


Posted by Brianna Porter on December 17, 2017

Excellent Service and Product

This product was bought as a gift and shipped directly to my home. I can’t review how well the product worked because I couldn’t even get a full month out of the bottle as half of the capsules were broken open in the bottle.UPDATED: Excellent costumer service and after receiving a new bottle I can say it is an excellent product!

Posted by Thomas on April 19, 2017

Used it for years

This has literally been my go-to test product for the last couple of years. I normally pick it up at Vitamin shoppe, but sometimes when there is a special, I buy it here. Of course you get a jump in sex drive and “focus”, but what I seem to get beyond that is a good muscle hardness and fullness. When i cycle off for a couple weeks, I can tell the difference. I’ve made consistent gains over the last few years as a Natty physiques competitor and I would say this has helped quite a bit. I do recommend this to my friends.

Posted by Hector on February 20, 2017

Just stacked up on 3 bottles.

I’ve used this for probably a couple years now and it has done exactly what it says. I typically take it before sleeping and I feel I get a better sleep. It think a change in my energy is related to this and the increase in test. When I do go off this for a couple weeks, the second week I feel more sluggish. Workouts are great on this – just strong and confident is how I would describe them. Not like taking a pre-workout. I use ISA-Test and I feel like I’m on my game. I’d recommend it for sure.

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