iSatori ISA-TEST® GF Testosterone Booster

Regular price $49.99

iSatori ISA-TEST® GF Testosterone Booster

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Regular price $49.99

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  • 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

Muscle. Strength. Performance.

Muscle Mass

Muscle Mass

Healthy test levels promote protein synthesis and encourage tissue growth.



Helps decrease the feeling of fatigue and helps improve overall mood.



Formulated to support a strong sex drive and healthy libido.

Product Information


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 ISA-TEST GF 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. ∆

Supplement Facts

Serving Size: 4 Capsules
Serving Per Container: 30

Amount Per Serving% DV
Vitamin C (As Ascorbic Acid)25mg42%
Vitamin B6 (Pyridoxine HCL)7mg350%
Magnesium (As Oxide & Aspartate)300mg75%
Zinc (As Zinc Aspartate)20mg133%
ISA-TEST™ GF a Proprietary Blend containing:1714mg*

Tribulus Extract, (Tribulus Terrestris L.) (aerial parts), (60% total saponins, 20% Protodioscin), Epimedium Extract, (Epimedium sagittatum and Epimedium brevicornum)(leaf), (standardized for 10% icariin), EI-450™ Estrogen Inhibitor Citrus bioflavanoid complex, (Citrus sinesis) (peel & fruit), (50% hesperidin), Tongkat Ali Extract 20:1, (Eurycoma longifolia)(root), Ajuga turkestanica extract 10:1 (stem and leaf), Grape seed extract, (Vitis vinifera L.) (seed) , (standardized for 95% proanthocyanidins), Fenugreek Extract, Fenugreek Extract (trigonella foenum-graecum L.) (seed), (standardized for 50% fenuside saponins), Rhaponticum carthamoides extract (root), (standardized for 5% Ecdysterones)
SOMATRIN™, a Proprietary Blend containing:325mg*

Velvet bean extract, (Mucuna Pruriens) (Seed), Nettle extract 30:1, (urtica dioica)(root), Melatonin, (N-Acetyl-5-Methoxytryptamine)
ISAFLOW™, a Proprietary Blend containing:100mg*

Butchers Broom Extract, (ruscus aculeatus)(root) (standardized for 20% sterolic heterosides), Hesperidin Methyl Chalcone, (citrus sinensis)(fruit)(90% hesperidin)

*Daily Value not established.

Other Ingredients: Gelatin, Magnesium Stearate, Silicon Dioxide, Microcrystalline Cellulose, Titanium Dioxide, FD&C Red #40, FD&C Blue #1, FD&C Red #28.

Directions For ISA-TEST GF: As a dietary supplement, take 4 capsules with a full glass of water one hour prior to training. On non-training days, take 4 capsules one hour prior to bedtime. Take with or without food. FOR BEST RESULTS, use continuously for a minimum of 8 weeks.
What does the research say about ISA-TEST GF, and is it safe?
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.∆
How can I take this product for maximum results?
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.
Do I need to "load" or "cycle"?
"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.
Why is it so important for men to suppress estrogen?
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
Are there other supplements I should take to enhance the benefits?
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.
Scientific References
  • 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.
Athlete holding iSatori ISA-TEST Testosterone Booster


Uses a sophisticated "micro-particlization" process, so it starts working from the very first dose to help the body's natural testosterone production. No other testosterone formula contains this state-of-the-art delivery technology.

Nic Troupe

Powerful Multi-Phase Test Booster For Muscle, Libido, Strength And Performance!

ISA-TEST® GF is high performance testosterone booster comprised of a precise combination of natural ingredients clinically shown to cause increases in testosterone and a reduction in the "female-hormone" estrogen.


Loading or cycling is not necessary. And because it is an herbal based supplement, it won't shut down your body's own production of testosterone; so you won't need to cycle on and off the product.

ISA-TEST GF is designed to promote noticeable gains in strength, increased muscle mass, and improved sexual drive and performance.

EI-450™, SOMATRIN, ISAFLOW trademarks are owned by FitLife Brands Inc.
ISA-TEST is a registered trademark of FitLife Brands inc.


Ask a Question
  • Can this be stacked with 17 Beta?

    Thank you for our inquiry. Yes. You can take 17 Beta in the morning prior to workout and Isatest at night. Isatest contains Melatonin that can aid in sleep as well. 

    Fitlife Brands, INC Customer Service


Customer Reviews
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Leobardo d.
United States United States


So far so good. A week using ISA TEST and I feel great. More energy. Had a issue with the shipping however Tina in customer service fixed everything. Great product and customer service.

Phil B.

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.

Patrick M.
United States United States

Works for me.

Great product with no side effects.

Ruddy J.
United States United States

Great supplement

Great supplement I felt the different of strength by the 4th day of using it after that it was like I became the hulk lol, will keep using this supplement and also I highly recommend it to anyone who is looking to increase their strength out there,

Jason J.
United States United States

No title.

Great. Works like I hoped it would.