Current daily formula combines D-aspartic acid, KSM-66 ashwagandha, Panax ginseng, fenugreek, zinc, vitamin D and six additional ingredients; company publishes research context including mixed and null findings
GLASGOW, Scotland, September 25, 2026 — Wolfson Brands (UK) Limited has confirmed U.S. availability of the current 12-ingredient TestoPrime formulation, a dietary supplement for adult men, while publishing updated research context for several ingredients listed on the product label.
The current formula includes D-aspartic acid, KSM-66 ashwagandha root extract, Panax ginseng, fenugreek, green tea extract, pomegranate extract, zinc, vitamin D, vitamin B6, vitamin B5, garlic extract and black pepper extract.
The evidence presented in the research overview consists of controlled studies involving individual ingredients, together with guidance from sources including the National Institutes of Health. No published clinical trial of the complete TestoPrime formulation is cited in this announcement. Findings involving individual ingredients are therefore presented as research context rather than evidence of an outcome from the finished product.
“The D-aspartic acid research is a useful example of why study conditions matter,” said Neil Browers, Product Support at Wolfson Brands. “An early study reported a change at approximately three grams per day, while later research in resistance-trained men did not reproduce that result consistently. Those studies provide information about D-aspartic acid under specific research conditions, not about the complete TestoPrime formula.
Current 12-Ingredient TestoPrime Formula
TestoPrime is supplied as a capsule supplement for adult men. The current product information identifies 12 ingredients, including:
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D-aspartic acid
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KSM-66 ashwagandha root extract
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Panax ginseng
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Fenugreek
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Green tea extract
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Pomegranate extract
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Zinc
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Vitamin D
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Vitamin B6
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Vitamin B5
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Garlic extract
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Black pepper extract
Ingredient quantities and serving directions are provided on the current product label.
Find more details about ingredients of Testo Prime on their official website.
Those quantities can help consumers compare product specifications with doses used in published research. Such comparisons still require caution because studies may use different extracts, participant populations, treatment periods and outcome measures.
A study involving an isolated ingredient does not constitute evaluation of the complete 12-ingredient formulation.
D-Aspartic Acid: Human Studies Have Produced Different Results
D-aspartic acid is an amino acid that has been investigated in relation to hormone signaling. An early study published in Reproductive Biology and Endocrinology examined approximately 3 grams per day of D-aspartic acid for 12 days.
The study included 23 men receiving D-aspartic acid and reported an increase in measured testosterone compared with baseline and a control group.
Later research did not reproduce that finding consistently. A randomized study involving resistance-trained men examined 3 grams and 6 grams per day of D-aspartic acid. Researchers reported no significant increase in testosterone in the 3-gram group, while the 6-gram group showed a reduction in some measured hormone values.
Differences between the studies may reflect participant characteristics, baseline hormone levels, training status, study duration or other factors.
Taken together, the findings demonstrate that results from one short trial should not be generalized to all adult men or applied automatically to a multi-ingredient supplement. The studies evaluated D-aspartic acid independently. Neither trial evaluated TestoPrime.
KSM-66 Ashwagandha: Research Depends on Extract, Population and Outcome
Ashwagandha (Withania somnifera) is a botanical with a long history of use in Ayurvedic practice. KSM-66 is a standardized ashwagandha root extract that has been used in human research. One randomized, double-blind, placebo-controlled crossover study published in the American Journal of Men’s Health included 43 overweight men between 40 and 70 years of age.
Participants received a standardized ashwagandha extract or placebo during different phases of the study. Researchers reported differences in some measured hormone markers during the ashwagandha phase. However, self-reported measures of fatigue and vigor did not differ significantly between treatment phases. The study was relatively small and short. It also used a particular standardized preparation in a defined study population. Results involving one ashwagandha extract should not automatically be applied to every extract, dose or multi-ingredient formulation.
Ashwagandha has also been studied extensively in relation to stress and perceived stress measures, but study designs and preparations vary. For TestoPrime, these studies provide ingredient-level research context. They do not constitute clinical evaluation of the finished product.
Zinc and Vitamin D: Nutritional Status Matters
Zinc and vitamin D are essential nutrients with established physiological roles. Research examining these nutrients in relation to hormone measurements illustrates the importance of baseline nutritional status.
A study published in Nutrition examined zinc status in healthy young and older men. Researchers reported that restricting dietary zinc in young men was associated with declining testosterone measurements. In older men with marginal zinc deficiency, zinc supplementation was associated with increased measurements during the study period.
The findings are particularly relevant to deficient or marginally deficient populations. They do not establish that consuming additional zinc produces the same result in adults who already obtain adequate zinc.
Vitamin D research shows a similar distinction. A randomized trial published in Hormone and Metabolic Research evaluated vitamin D supplementation in overweight men over a one-year period. Researchers reported changes in measured testosterone in the supplemented group.
However, later research involving populations with different baseline vitamin D status has not consistently reproduced the same findings. For that reason, research involving deficiency or low nutrient status should not be generalized to people whose intake and blood levels are already adequate.
The National Institutes of Health Office of Dietary Supplements lists an adult tolerable upper intake level of 40 mg per day for zinc and 4,000 IU per day for vitamin D from all sources. Consumers using multiple supplements should consider their combined intake.
Panax Ginseng: Research Varies by Preparation
Panax ginseng has a history of traditional use in East Asian wellness practices. The root contains compounds known as ginsenosides, and their concentration can differ considerably between extracts.
Human studies have investigated Panax ginseng in several areas, including fatigue, physical function and general well-being. Results are not uniform. Clinical research has used different extract types, daily quantities and treatment periods. This makes it difficult to transfer findings from one preparation directly to another.
The presence of Panax ginseng in TestoPrime should therefore be treated as a formulation detail rather than evidence that the finished supplement produces an outcome reported in an isolated ginseng study.
Fenugreek: Study Population Is Important
Fenugreek (Trigonella foenum-graecum) contains naturally occurring compounds including saponins and soluble fiber. A number of human studies have evaluated fenugreek extracts, including research involving resistance-trained adults.
Some trials have reported differences in body-composition, strength or hormone-related measurements when particular standardized fenugreek preparations were used alongside supervised exercise programs. Those studies generally involved defined extracts and relatively specific populations.
Results involving young, resistance-trained participants following controlled exercise programs cannot automatically be generalized to older, sedentary or otherwise different populations. Fenugreek may also influence blood glucose and can interact with medicines that affect blood sugar or blood clotting.
Research involving an isolated fenugreek preparation does not establish an effect for the complete TestoPrime formula.
Green Tea and Pomegranate Extracts
Green tea and pomegranate extracts are also identified within the TestoPrime formula. Green tea contains catechins, including epigallocatechin gallate, while pomegranate contains naturally occurring polyphenols.
Both have been investigated across cardiovascular, metabolic and other research areas. However, neither ingredient has an established product-specific effect simply because it appears in a multi-ingredient supplement.
Research involving concentrated green tea extract also carries safety considerations. Rare cases of liver injury have been reported with some concentrated green tea supplements, particularly at higher quantities or under certain conditions.
Consumers should therefore follow the product label and discuss supplement use with a healthcare professional when appropriate.
Additional Ingredients in the Current Formula
The remaining ingredients include vitamin B6, vitamin B5, garlic extract and black pepper extract. Vitamin B6 is an essential water-soluble vitamin involved in numerous enzyme reactions, including processes associated with amino-acid metabolism and normal neurological function.
Vitamin B5, also called pantothenic acid, is required for the synthesis of coenzyme A and participates in normal energy metabolism. Garlic extract has been studied across cardiovascular and metabolic research areas using different preparations and quantities.
Black pepper extract contains piperine, a compound studied for its effects on the absorption and metabolism of certain substances. The relevance of those findings depends on the preparation, quantity and other compounds being consumed. These established nutritional functions or individual research findings do not demonstrate an outcome for the complete TestoPrime formulation.
What Ingredient Research Does and Does Not Establish
The TestoPrime research overview distinguishes three questions:
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What is an ingredient and what is its established nutritional or physiological role?
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What have researchers found when that ingredient was examined independently?
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What has been demonstrated for the complete TestoPrime formula?
Evidence answering the first or second question does not automatically answer the third. The referenced studies used specific doses, preparations, participant populations and treatment periods.
Some reported measurable differences. Others reported no significant change or findings that were not reproduced consistently in subsequent research.
The complete TestoPrime formulation combines 12 ingredients, and the research discussed in this announcement should not be interpreted as a clinical trial of that combination.
“We included the mixed findings because they are part of the evidence,” Browers added. “A study that reports no significant change is just as relevant to understanding an ingredient as a study that reports a difference. Presenting both gives a more accurate picture of what has actually been investigated.”
Safety and Suitability
TestoPrime is intended for adult men. Individual ingredients within the formula can require additional consideration depending on medications, existing health conditions and other supplements being used.
Consumers should consult a qualified healthcare professional before use if they:
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take prescription medications;
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take medicines affecting blood sugar, blood pressure or blood clotting;
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manage a liver, thyroid or other diagnosed medical condition;
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use other supplements containing zinc or vitamin D;
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use multiple botanical supplements; or
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are scheduled for surgery or another medical procedure.
Ashwagandha has been associated with rare reports of liver injury and may affect thyroid function in some individuals.
Fenugreek can influence blood glucose. Concentrated green tea extracts have also been associated with rare liver-related adverse events. The current physical Supplement Facts panel should remain the primary source for serving instructions, ingredient quantities and product warnings.
U.S. Availability
TestoPrime is available through the official TestoPrime website. Wolfson Brands has confirmed U.S. availability of the current 12-ingredient TestoPrime formula. TestoPrime is supplied as capsules for daily adult use. Current product information, ingredient quantities and serving directions are provided on the product label and through TestoPrime’s U.S. product information.
The company does not describe the individual studies referenced in this announcement as clinical evaluation of the complete formula.
About Wolfson Brands
Wolfson Brands (UK) Limited is a Glasgow, Scotland-based health and wellness company that develops and distributes consumer products internationally.
Its portfolio includes dietary supplements marketed across multiple consumer wellness categories and geographic markets. For TestoPrime, Wolfson Brands provides ingredient information, serving directions, safety information and research references intended to distinguish established ingredient evidence from claims about the finished formulation.
References
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Topo E, Soricelli A, D’Aniello A, et al. The role and molecular mechanism of D-aspartic acid in the release and synthesis of LH and testosterone in humans and rats. Reproductive Biology and Endocrinology. 2009;7:120.
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Melville GW, Siegler JC, Marshall PW. Three and six grams supplementation of D-aspartic acid in resistance-trained men. Journal of the International Society of Sports Nutrition. 2015;12:15.
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Lopresti AL, Drummond PD, Smith SJ. A randomized, double-blind, placebo-controlled, crossover study examining the hormonal and vitality effects of ashwagandha in aging, overweight males. American Journal of Men’s Health. 2019;13(2).
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Prasad AS, Mantzoros CS, Beck FW, et al. Zinc status and serum testosterone levels of healthy adults. Nutrition. 1996;12(5):344–348.
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Pilz S, Frisch S, Koertke H, et al. Effect of vitamin D supplementation on testosterone levels in men. Hormone and Metabolic Research. 2011;43(3):223–225.
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NIH Office of Dietary Supplements. Zinc — Health Professional Fact Sheet.
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NIH Office of Dietary Supplements. Vitamin D — Health Professional Fact Sheet.
Media Contact
Neil Browers
Product Support, Wolfson Brands
Wolfson Brands (UK) Limited / TestoPrime
12 Payne Street
Glasgow, G4 0LF, United Kingdom
Email: support@testoprime.com
U.S. Support: +1 888-212-8930
Website: TestoPrime.com
These statements have not been evaluated by the U.S. Food and Drug Administration. TestoPrime is a dietary supplement and is not intended to diagnose, treat, cure or prevent any disease. Research referenced in this release concerns individual ingredients studied independently and does not constitute clinical evaluation of the complete TestoPrime formulation or endorsement by the cited researchers, journals or institutions.
