TestoFuel is marketed primarily as a Testosterone-booster and contains some pretty common test-boosting ingredients such as D-Aspartic Acid and Fenugreek…
Zinc is required for Testosterone production, so it is commonly included in test-boosters like TestoFuel. We discuss the relationship between Zinc and Testosterone a bit more in-depth in this article, but to sum it up: Zinc supplementation is useful for encouraging optimal Testosterone levels, but will not boost Testosterone beyond the normal range.
TestoFuel provides 10mg of elemental Zinc per serving which is not an overwhelming amount, but surely enough to encourage optimal Testosterone levels assuming at least another 5mg or so is obtained through diet.
D-Aspartic Acid has become extremely popular as a Test-booster in recent years, with research suggesting it is indeed effective, at least in the short term.
A 2012 study from “Advances in Sexual Medicine”, the subjects of which were infertile men (initially low Testosterone) found that 2.66g of D-Aspartic Acid was able to significantly increase Testosterone levels when measured after 90 days of supplementation. These results were in-line with those of an earlier study from 2009 in which D-Aspartic Acid supplementation raised Testosterone by 42% after 12 days in healthy men (initially normal Testosterone).
However, a 2013 study published in “Nutrition Research” found that athletes who supplemented with D-Aspartic Acid for 28 days showed no difference in testosterone levels.
The researchers in the failed study noted abnormally high levels of D-Aspartate Oxidase, the enzyme which degrades D-Aspartic Acid, indicating that prolonged supplementation in individuals with healthy Testosterone levels may cause “negative feedback”.
TestoFuel contains 2300mg of D-Aspartic Acid per serving, kind of an odd dose considering that clinical doses range from 2600-3200mg.
Siberian Ginseng has traditionally been used as an adaptogen, with not much research regarding its effects on Testosterone.
A 2001 study, published in “Life Sciences”, found that an extract of Siberian Ginseng equaling roughly 4g of root powder decreased the Testosterone:Cortisol ratio in human subjects when consumed prior to exercise.
Other than this, Siberian Ginseng has never been shown to influence Testosterone levels in humans.
FENUGREEK SEED EXTRACT
While Fenugreek (as Testofen) has demonstrated the ability to increase Testosterone in one study, it has failed to do so elsewhere under similar conditions. We discuss Fenugreek and its effects on Testosterone in depth in this article.
At this time, the reason for the discrepancy is unknown. So, as a Test-booster, the reliability of Fenugreek should be questioned. Like Tribulus, Fenugreek is an effective libido enhancer and may provide the illusion of increased Testosterone regardless of whether an actual increase occurs.
TestoFuel provides 100mg of Fenugreek per serving, less than what has been used clinically to boost Testosterone, but still potentially effective with regards to libido enhancement.
TestoFuel includes Oyster extract because Oysters are naturally high in Zinc. However, there is not difference between elemental Zinc in supplement form and that which can be found in Oysters. So, in the context of TestoFuel, Oyster extract functions the same as Zinc.
THE BOTTOM LINE
TestoFuel has what it takes to encourage optimal Testosterone levels. Will it boost Testosterone far beyond the normal range? Probably not, but it may certainly benefit individuals with abnormally low Testosterone levels. At about $70 per 30 serving container, however, TestoFuel is pretty over-priced and there are definitely better/more cost-effective options out there.
Still not sure which test-booster is right for you? Check out our Best Testosterone-Boosters List!
- D’Aniello, Gemma, et al. “d-Aspartate, a key element for the improvement of sperm quality.” Advances in Sexual Medicine 2 (2012): 45.
- Topo, Enza, et al. “The role and molecular mechanism of D-aspartic acid in the release and synthesis of LH and testosterone in humans and rats.” Reprod Biol Endocrinol 7.120 (2009): 6.
- Willoughby, Darryn S., and Brian Leutholtz. “d-Aspartic acid supplementation combined with 28 days of heavy resistance training has no effect on body composition, muscle strength, and serum hormones associated with the hypothalamo-pituitary-gonadal axis in resistance-trained men.” Nutrition Research 33.10 (2013): 803-810.
- D’Aniello, Autimo, Anna Di Cosmo, Carlo Di Cristo, Lucio Annunziato, Leonard Petrucelli, and George Fisher. “Involvement of D-Aspartic Acid in the Synthesis of Testosterone in Rat Testes.” Life Sciences 59.2 (1996): 97-104.
- Gaffney, Ben T., Helmut M. Hügel, and Peter A. Rich. “The effects of< i> Eleutherococcus senticosus and< i> Panax ginseng on steroidal hormone indices of stress and lymphocyte subset numbers in endurance athletes.” Life sciences 70.4 (2001): 431-442.
- Bushey, Brandon, et al. “Fenugreek Extract Supplementation Has No effect on the Hormonal Profile of Resitance-Trained Males.” International Journal of Exercise Science: Conference Proceedings. Vol. 2. No. 1. 2009.
- Steels, Elizabeth, Amanda Rao, and Luis Vitetta. “Physiological Aspects of Male Libido Enhanced by Standardized Trigonella foenum‐graecum Extract and Mineral Formulation.” Phytotherapy Research 25.9 (2011): 1294-1300.