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TestoFuel Review: The right testosterone booster for you?

We help you determine whether TestoFuel will get you those sought-after gains in focus, strength, libido, and overall vitality.

Last Updated: Jan 4, 2023
TestoFuel Review

There’s nothing more frustrating than putting in time and effort at the gym without seeing results in the mirror. The good (and bad) news is that low testosterone could be the culprit.

Starting at age 30, men produce less testosterone due to aging. A recent study found that by age 45, 40% of men show signs of a low T count. Besides making it difficult to build muscle, low testosterone causes decreased libido, mood disorders, fatigue, memory problems, and a weaker sense of wellbeing.

TestoFuel is a testosterone supplement that claims to prevent these conditions and get you the gains you’ve failed to achieve thus far. But does it work? And more importantly, is it right for you?

Review Summary


  • Encourages natural testosterone production
  • Uses some clinically proven ingredients
  • May improve metabolism
  • Provides essential vitamins and minerals
  • Relatively safe and easy to use
  • Buy 3 months, get 1 month free


  • Slightly pricier than other testosterone supplements
  • No money-back guarantee on opened products
  • Not many flexible, cost-saving purchase options
  • Relies on too many animal studies

Bottom line

TestoFuel is a fine choice among testosterone supplements. Its simple list of proven ingredients gives it the potential to improve your performance and results in the gym. It won’t help you make gains unless low testosterone is your issue. Speaking to a doctor first and having your testosterone tested is critical in your choice to try it.

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TestoFuel is a supplement designed to naturally increase testosterone production, yielding more lean muscle growth.

Incorporating clinically proven ingredients and essential vitamins into an easy-to-swallow capsule, TestoFuel can increase your strength, build muscle, and reduce body fat. It’s effective if low testosterone is what’s holding you back. Save more when you buy in bulk.

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Why you should trust us

Over the past two decades, Innerbody Research has helped tens of millions of readers make more informed decisions involving staying healthy and living healthier lifestyles.

We extensively test each health service or product we review. We try our best to give you, our readers, an unbiased exploration of at-home health options, free of marketing jargon or gimmicks. We evaluate products and services based on their adherence to quality, the latest medical evidence and health standards, and a simple question: would we buy the product or service ourselves if it weren’t part of our job, and would we recommend it to family and friends?

Additionally, like all health-related content on this website, this review was thoroughly vetted by one or more members of our Medical Review Board for accuracy.

What is TestoFuel?

TestoFuel is a capsule supplement that encourages healthy levels of testosterone. It does so using a blend of clinically tested herbs, vitamins, and minerals. Maintaining high testosterone levels can improve muscle growth (TestoFuel’s main purpose), increase strength and libido, reduce fat, and improve your mood.

Robert Parker founded a company named Roaring Ambition in 2014. The company added TestoFuel to their lineup to round out the fitness help available from their other offerings. Their GMP certification means you can expect consistency of the highest industry standards. And local suppliers in the US and the UK ensure you get a product close to home, delivered quickly.

Who should consider TestoFuel?

Anyone over 18 who can’t seem to put on muscle despite their best efforts might consider trying TestoFuel. When a balanced diet and consistent hard work in the gym aren’t getting you the gains you’re looking for, low testosterone could be the culprit. That’s because, as studies show, testosterone builds mass by encouraging better protein synthesis.

After age 30, testosterone levels tend to drop by about 1% every year. So, older men could also use TestoFuel to help offset the effects of aging and maintain optimal testosterone levels.

Who won't find TestoFuel useful?

Anyone failing to make gains for a reason other than low testosterone might want to give TestoFuel a pass. Testing your testosterone level is the best way to ensure you actually need a testosterone booster.

Fortunately, at-home testosterone tests have become more reliable and readily available in recent years. They’ll save you a trip to the doctor and, if you’re uninsured, might save you a bit of money, too. Innerbody readers get discounts on some of these tests, as well. You can find them all in our comprehensive guide to the best at-home testosterone tests.

How TestoFuel works

One capsule of TestoFuel contains nine testosterone-promoting herbs, vitamins, and minerals. You’ll take four capsules per day with meals. Their website recommends one at breakfast, one with an early snack, one with lunch, and one with dinner. It can take up to two months to see noticeable results.

There is no research published about TestoFuel specifically. But this 2019 study on testosterone supplements showed that 24.8% of these supplements improved T levels. One caveat was that 61.5% of the 109 ingredients listed had no recorded data. So, a closer look at each of the nine main ingredients in TestoFuel should be more illuminating.

TestoFuel ingredients

Several of TestoFuel’s ingredients boast clinical research with solid evidence showing their effectiveness. Below, you’ll learn how each promotes testosterone production, a healthy metabolism, and better bodily function.

Vitamin D (4000 IU)

Our bodies synthesize vitamin D in response to UV exposure. But modern life gets in the way of leisure time outdoors for most people. That makes vitamin D supplements a safe and effective way to improve your health. And a 2010 study suggests that vitamin D may increase testosterone production. The study found a strong correlation between vitamin D supplements and higher testosterone levels, though these increases were within the margin of error.

Oyster Extract (100 mg) & Zinc (10 mg)

Oysters are packed with zinc, an essential mineral in several metabolic functions. The exact reason is unknown, but there are strong links between zinc deficiency and hypogonadism in men (low sex hormones). Oyster extract in TestoFuel works to prevent hypogonadism and encourage a healthy serum testosterone level, as you can see in this clinical study.

Ginseng (100 mg)

Ginseng is a popular herb thanks to its plethora of health benefits, from boosting mood and energy level to regulating blood sugar. Ginseng has plenty of male-specific benefits, too. A clinical study showed that ginseng extract significantly boosted serum and free testosterone levels. And it encouraged follicle growth along with increasing LH levels (Luteinizing hormones: they help testes create more testosterone).

Fenugreek (100 mg)

Fenugreek is an herb used in Mediterranean cuisine. Some claim it blocks a sex hormone binding globule (SHBG) from taking your free testosterone. In turn, that will raise your levels of free testosterone and encourage a healthy balance. But, the study referenced on the site is obscure, small in scope, and limited in its findings.

That said, another clinical study showed fenugreek caused a significant increase in free testosterone (98.7% vs. 48.8% of a placebo). Study participants also had modest gains in their max repetitions to failure in bench and leg presses.

Magnesium (200 mg)

Magnesium helps over 300 enzymatic functions like protein synthesis, muscle and nerve functions, and blood regulation. A healthy magnesium intake is one key to keeping your body at peak performance. And a clinical study shows that magnesium supplements can lead to higher serum and free testosterone levels.

Vitamins B6 (5 mg) & K2 (18 mg)

B6 helps maintain a healthy metabolism and strengthens your immune response. Low levels of B6 are also one cause of testosterone decline. Supplementing with TestoFuel can help you avoid this.

In an animal study, there’s some evidence that K2 increases testosterone levels by up to 70%. However, there are no studies supporting this claim in humans yet.

D-aspartic acid (2300 mg)

Releasing more testosterone into the bloodstream (serum testosterone) is the purported effect of D-aspartic acid. And it does have a significant role in synthesizing and releasing testosterone. A 2017 review found D-aspartic acid succeeded in 23 animal studies, but it showed inconclusive results in four human trials.

Is TestoFuel safe?

As with any supplement, you should carefully review the ingredients list (see above). All the ingredients included in the standard serving size are within safe levels.

But keep an eye on your vitamin D and magnesium if you take any other vitamins or supplements. You should take no more than 4000 mg of vitamin D per day. And make sure you don’t go over 350 mg of magnesium daily either. Going overboard on either may cause adverse effects.

In one study, fenugreek caused side effects in 45% of participants. But the dosage of the study was 5,175 mg daily — astronomically more than TestoFuel when used as directed. Experiencing diarrhea, an upset stomach, or bloating could signify fenugreek is to blame.


Each bottle is $65 and provides enough TestoFuel to last one month. Other purchasing levels can save you some money if you have more available to spend up-front.

Here’s a quick look at how TestoFuel pricing breaks down:

  • One-month supply: $65
  • Two-month supply: $130 ($65/bottle)
  • Four-month supply: $195 ($48.75/bottle)
  • Twelve-month supply: $546 ($45.50/bottle)

Is TestoFuel a good value?

TestoFuel is among the highest price tier of testosterone supplements. It costs about $5-10 more than similar products. Some of its competitors provide higher doses of key ingredients and additional ingredients that TestoFuel lacks. And some of those competitors have vastly superior money-back guarantees.

If you want to compare TestoFuel with the absolute best in the testosterone supplement landscape, check out our guide to the best testosterone boosters.

Pricing, HSA, FSA, and health insurance

TestoFuel accepts payment from major credit cards, PayPal, and Amazon Pay. Shipping is free worldwide.

TestoFuel does not work with any insurance companies, and will not accept payment from HSA or FSA cards. Our research also indicates that there is no private insurer that will reimburse you for the purchase of any testosterone booster.

How we evaluate health products and services

At Innerbody Research, we customize our evaluation criteria depending on the type and nature of the health-related service or product. But in general, for health products and services, we have five broad areas that we explore in our evaluations, including:

Quality: How well does the company deliver its core service(s) to the customer? For testing services, does the company adhere to the latest and most advanced testing technologies and achieve a very high degree of accuracy? For non-testing telemedical or teletherapy services, is the quality of the service high enough that we would recommend it to loved ones without hesitation? If not, why not? For health products, does the product or device meet a high level of safety? Is it manufactured with high-quality standards? Has it – or have its ingredients – been subjected to effective studies that confirm effectiveness?

User-friendly: How intuitive and convenient is the service or product? Does the device, program, app, or website achieve a good degree of user-friendliness for its customers?

Value: Are you getting your money’s worth? Are there any hidden costs or charges? Does the company offer discounts?

Privacy: If health data is stored, will your data be stored securely? Are payments secure? Does a company market your information?

Customer support: Particularly in situations where ‘one size fits all’ doesn’t make sense, how well does the company help to make the service or product ideal for you or address your individual needs?

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