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.¹ Besides making it difficult to build muscle, low testosterone causes decreased libido, mood disorders, fatigue, memory problems, and a weaker sense of well-being. TestoFuel is a testosterone supplement that claims to prevent these conditions and get you the gains you’ve failed to achieve thus far.
TestoFuel gets a little lost among other testosterone boosters, as its ingredient profile, price point, and customer experience are average across the board. The fact that the company occasionally changes its formula without any notification introduces an element of danger we do not like. But the core of its formula — a high dose of vitamin D — might make it effective for a small group of men with low testosterone related to a nutrient deficiency.
At Innerbody Research, our team has spent over 300 hours extensively researching and, in some cases, testing testosterone boosters like TestoFuel. We’ve read more than 150 scientific articles focused on men’s sexual wellness, testosterone, and the various ingredients used in TestoFuel.
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. We’ll keep an eye on TestoFuel to ensure that all the information here remains accurate and up-to-date.
For the past two decades, Innerbody Research has helped tens of millions of people make more informed health-related purchasing decisions.
Evaluating a product like TestoFuel is relatively straightforward. We like to break down our evaluations into specific criteria that we believe reflect the wants and needs of the average patient or customer, and we do whatever additional research is necessary to make a confident assessment of a product’s potential.
Effectiveness typically comes first and holds the most sway over our final rating assessment. Provided there’s some potential there — or at least a suspicion that someone might want to try a given supplement, we move on to safety. Some men might be inclined to throw caution to the wind and try anything that might improve their sex lives, but on this page, you’ll have the opportunity to find out if a product is safe or not.
Our last two criteria — cost and convenience — comprise prices, discounts, subscription service, customer service, and more. These are all less influential on our overall ratings, but they are often the things that can tip the scales for men torn between two products.
Let’s take a closer look at each of these criteria for a clearer picture of whether TestoFuel might be a good fit for you.
Several ingredients in TestoFuel can boast at least a few clinical studies supporting their positive effects on men’s testosterone levels. None of these studies is statistically significant or so impressive that they can all but prove efficacy. Most are small in scale and funding and in dire need of being repeated for verification. That said, they imply that TestoFuel may offer a fair amount of efficacy for certain men, particularly those with specific nutritional deficiencies.
For example, TestoFuel recently added boron to its ingredient profile. Boron boasts several studies indicating that it can elevate testosterone levels, particularly among men with previous deficiencies. According to the National Institutes of Health, boron deficiency can lead to a reduction in vitamin D production,² which has known links to testosterone and semen quality.³ Both boron and vitamin D appear at doses consistent with research, meaning that TestoFuel may be potent enough to affect testosterone levels in men with lower-than-normal levels of either nutrient.
Some other ingredients, like ginseng or vitamin K2, have limited research indicating their potential to increase testosterone levels, and what research exists uses doses far higher than those provided by TestoFuel.
By far, the biggest knock on TestoFuel is the relative frequency with which the company changes its formula. We’ve found two alternative formulas for the supplement sold within the last five years. The differences aren’t enormous, but if you’re taking something on a regular basis and it suddenly includes ingredients that weren’t previously there, that could put you at risk for allergic reactions, contraindications, or other adverse effects without your knowledge.
Supplements like TestoFuel almost always come with the same basic side effect potential for healthy users. Men might experience things like:
But specific ingredients in some testosterone boosters pose greater threats, most notably among men with certain pre-existing conditions. Ginseng, for example, has known anticoagulant effects, so it can be dangerous for men on blood thinners like warfarin.⁴ And the 4,000IU of vitamin D included in TestoFuel is right around the upper limit for daily intake.⁵ So anyone getting bountiful sunshine or already taking a multivitamin containing vitamin D could put themselves at risk for mild toxicity.
Ultimately, TestoFuel is a hair safer than the average testosterone booster, especially considering its paltry doses of ingredients like ginseng and fenugreek. Still, there are safer options out there that don’t sacrifice efficacy.
Our cost consideration is a combination of price, bulk or subscription discounts, return policy, and shipping costs. Most testosterone boosters cost somewhere between $50 and $80. TestoFuel’s $65 price tag puts it right in the middle of that range. And like most of its competitors, it eschews subscription programs in favor of bulk purchase savings.
At the highest bulk purchasing level, the cost per bottle of TestoFuel comes down to $45.50. Other options offer deeper discounts when you get to those higher levels, like TestoPrime’s $30/bottle cost when you buy a five-month supply.
Here’s a quick look at how TestoFuel compares to its closest competitors:
|Cost per month||Cost per month at highest bulk or subscription level||Money-back guarantee|
|Test Boost Max||$49||$32.50||Lifetime|
|Roman Testosterone Support||$35||$29||None|
|Testogen capsules||$60||$36||100 days|
As you can see, most other companies get to a lower price per month at their highest bulk levels. And without any kind of money-back guarantee, there’s less protection for your investment than you’ll get from companies like TeatoPrime or Performer 8, both of whom offer lifetime guarantees.
If we’re going to give a product a high rating for convenience, it has to excel in several areas, including customer service, shipping logistics, and dosage. TestoFuel’s customer service is lackluster, with a contact form and an email address but no phone support or live chat. This is typical of TestoFuel’s parent company, Roar Ambition, but certainly not the standard among testosterone boosters. For example, TestoPrime offers chat support and WhatsApp contacts you can use to talk to someone immediately.
Shipping logistics from TestoFuel are fine, with orders usually arriving in 2-4 business days. But once you receive the product, taking it is a bit of a hassle; TestoFuel recommends taking one pill with breakfast, another with dinner, and two more with separate snacks throughout the day. That means you have to carry pills with you to the office if you work away from home, and it would be way too easy for the average person to forget a dose here and there.
Special Offer: 1 Month FREE When You Buy a 3-Month Supply
TestoFuel is a nutritional supplement made by Roar Ambition that aims to encourage healthy levels of testosterone in men. Its ingredient profile contains a few components with clinical research suggesting this capability, but that research is small in scale and in need of more repetition for us to be confident in it. Still, certain groups of men may find that TestoFuel’s ingredients are sufficient to improve their testosterone levels.
TestoFuel contains 10 ingredients:
Of those components, vitamin D, D-aspartic acid, and boron are the only ones that appear in doses similar to those we’ve seen in successful studies. This formula has changed over the years. Since we last reviewed TestoFuel, the formula has:
An even older version of the formula contained 5,000IU of vitamin D, but this was reduced, likely due to the recommended daily upper limit sitting at 4,000IU.
After age 30, testosterone levels in men tend to drop by about 1% every year. So men over 30 who find it harder to put on muscle or burn fat than they used to might consider a testosterone booster like TestoFuel, especially if other symptoms of low testosterone are present. These symptoms include:
Of course, even a combination of these symptoms doesn’t guarantee you have low testosterone. The only way to know that for sure is to have your testosterone levels checked. You can do this through your doctor or through an at-home test, the latter of which has become more convenient in recent years. You can find them all in our comprehensive guide to the best at-home testosterone tests.
Insider Tip: The American Urological Association recommends two testosterone tests with low results as a baseline to diagnose someone with low T, so you may need to buy more than one test from most companies. Roman is the only company we’re aware of that provides a test with two days of collection built in, so you test twice for one price.
As several studies indicate, ingredients like zinc, vitamin D, and boron might be more effective for men deficient in these nutrients. Men who are generally healthy — especially men who know their testosterone levels are normal — likely won’t find any benefit from taking TestoFuel. This is also true for men who already take a multivitamin that provides some of the ingredients also present in TestoFuel.
TestoFuel may also be insufficient for men with significant hypogonadism, especially those with an underlying condition contributing to their hormonal imbalance. These men may need stronger interventions like prescription medication or testosterone replacement therapy, which we’ll discuss in our alternatives section below.
One capsule of TestoFuel contains 10 ingredients — at least right now. TestoFuel changes its formula every once in a while without making any kind of announcement on the website. When we last reviewed TestoFuel, it contained nine ingredients, not 10. And since then, one has been removed, two new ingredients have been added, and the doses of another three have been reduced.
The current formula consists of vitamins, minerals, botanicals, and amino acids. 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. This may be because the ingredients can cause some digestive upset, so taking all four at once might be more hazardous. Ultimately, this is a negative in our book, as a regimen that asks you to remember four dose times daily is cumbersome, to say the least.
There is no research published about TestoFuel specifically, so we find it helpful to research its individual ingredients, most of which have some studies linking them with testosterone — some with positive results, and some otherwise. Let’s take a look at what we found out:
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 an effective way to improve your health. A 2011 study suggests that vitamin D may increase testosterone production.⁶ The study found a strong correlation between vitamin D supplements and higher testosterone levels, though these increases were within the margin of error.
In an animal study, there was some evidence that K2 increases testosterone levels by up to 70%.⁷ However, the amount of K2 administered in the study was massive, and there are no studies supporting this claim in humans yet.
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. A clinical study showed that magnesium supplements can lead to higher serum and free testosterone levels, particularly among active individuals.⁸ But the study used 10mg/kg of body weight, meaning that a 200lb man would receive 2,000mg of magnesium compared to TestoFuel’s 70mg dose.
Oysters are packed with zinc — around 5.5mg per oyster — which is why we’ve put these two ingredients together here. And zinc is 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).⁹ However, men with healthy zinc levels might not see much benefit from supplementation.
A 2017 review found that D-aspartic acid succeeded in 23 animal studies at releasing more testosterone into the bloodstream (serum testosterone).¹⁰ However, that same review showed inconclusive results in four human trials. D-Aspartic acid may have a role to play here, but there isn’t any convincing evidence just yet.
A review that compared four trials of maca’s influence on sexual performance found mixed results,¹¹ while another study supports claims of performance enhancement but undercuts the botanical’s influence on testosterone levels.¹³ Those papers are from 2010 and 2002, respectively. A 2016 review found improvements in semen parameters after maca use, and the included studies employed doses ranging from 1,000mg-5,000mg encapsulated maca powder.¹⁴ The extract used in TestoFuel provides the powder equivalent of about 1,800mg.
Ginseng is a popular herb thanks to its various health benefits. A small-scale clinical study showed that ginseng extract significantly boosted serum and free testosterone levels.¹⁵ However, ginseng can have an anticoagulant effect, complicating its use among men on blood thinners.¹⁶
Fenugreek is an herb used in Mediterranean cuisine. There's a bit of conflicting research about its efficacy for male sexual wellness. One clinical study using 600mg of fenugreek daily showed a significant increase in free testosterone (98.7% vs. 48.8% of a placebo).¹⁷ Another study using 500mg daily found no meaningful difference in free testosterone.¹⁸
Several boron studies included in this comprehensive review found a connection between boron supplementation and increased testosterone levels.¹⁹ The effect was especially significant among participants who were previously deficient in boron. Studies used daily doses as low as 6mg, making TestoFuel’s recent addition of 8mg boron a promising one.
As with any supplement, you should carefully review the ingredients list (see above) and talk to your doctor before you start taking it. As we’ve discussed, TestoFuel provides a large dose of vitamin D, and anyone consuming large quantities of fortified foods, getting an abundance of sunshine, or taking a multivitamin on top of a TestoFuel regimen risks consuming more vitamin D than public health agencies recommend.
Some other ingredients in TestoFuel are associated with high incidences of side effects. In one study, fenugreek caused side effects in 45% of participants.²⁰ But the dosage of the study was 5,175mg daily — a lot more than TestoFuel provides.
There is also evidence that ginseng can interact poorly with anticoagulants like warfarin. But as with the fenugreek dose, TestoFuel’s ginseng dose is likely too low to be a cause for safety concern.
Supplements like TestoFuel tend to cause some digestive issues and other common side effects, such as:
Dividing up your four daily TestoFuel doses as the company recommends and accompanying them with food may help curtail these effects. If they persist or are especially intense, you should stop taking TestoFuel and talk to your doctor.
Each bottle of TestoFuel is $65 and provides enough TestoFuel to last 30 days. 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:
TestoFuel used to be available in a 12-month supply for $546 (45.50/bottle), but that’s no longer listed on the company’s website. We’ve seen this trend with a few other men’s sexual wellness supplements. While it doesn’t necessarily come as a surprise, it is still something we don’t like seeing, as it eliminates your opportunity to save the most money.
Two-month and four-month supplies also come with e-books and video guides from Boss Workouts that focus on gaining lean muscle mass. Boss Workouts is the fitness tutorial arm of Roar Ambition, TestoFuel’s parent company. Most other testosterone boosters also offer at least a small discount at the two-month supply level, but two months of TestoFuel costs the same as it would if you bought two one-month supplies. The only difference is the inclusion of the workout plan.
Shipping is free for any order of TestoFuel, regardless of the size. And TestoFuel ships worldwide.
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.
Given that TestoFuel falls around the middle of our rankings for testosterone boosters, we want to help you understand your alternatives. There are plenty of other testosterone boosters available, and we’ll talk about some of them here. But there are also prescription interventions you can access through your doctor if you take a test that shows you have low testosterone.
Let’s go over these alternatives to help you find the best course of action.
Most testosterone boosters rely on similar ingredients to get the job done, but they aren’t all equally likely to help you. Some offer balanced blends, while others provide meager rations of most ingredients revolving around one hero component that boasts good clinical research and appears at a relevant dose. We certainly prefer the balanced approach as long as doses are still close to or more than relevant compared to studies.
We have a complete guide to testosterone boosters that goes deeper into each of the following companies, but here are a few highlights:
TestoPrime is our top pick among testosterone boosters in 2023, edging out its competition with a good mix of well-researched ingredients and a lifetime guarantee. Its price point is average, and like all testosterone boosters, it won’t work for all men.
In addition to providing at-home testosterone testing and prescription clomiphene (which we’ll discuss below), Roman offers a simple, effective supplement that’s competitively priced and available as a subscription. And it’s one of the few male enhancement products to contain copper in addition to zinc — a win for safety, considering that copper levels can drop with zinc supplementation.
While technically more of a traditional “male enhancement” pill than a testosterone booster, Performer 8 carries a hefty dose of ashwagandha, which we’ve seen raise testosterone in multiple studies. And if your interest in T boosters originates in the bedroom, this might be your best option.
Clomiphene (brand name Clomid) is an FDA-approved treatment for infertility and polycystic ovarian syndrome in women, but it’s yet to be approved for use in men. Thanks to research indicating its potential as a testosterone therapy, doctors have begun to prescribe it off-label for such use.
Clomiphene acts in the brain to trick it into thinking your body has an overabundance of estrogen. In response, your body begins producing more testosterone.²¹ The results of clinical trials have been impressive, with a high degree of efficacy and a low incidence of side effects.
Fascinating fact: one known side effect of clomiphene in women is a dramatic increase in the likelihood of having twins if a woman becomes pregnant. This side effect has not been reproduced in male subjects who impregnate women not taking clomiphene.
The only way to get clomiphene is by prescription, and you’ll have to show low T levels on at least two tests for a doctor to prescribe it. Roman is the only telehealth service offering clomiphene prescriptions at this time, and that’s part of a relatively expensive monthly subscription ($169/month). If you have insurance, you may be able to access clomiphene for less.
One surefire way to raise testosterone levels is to introduce the hormone from without. That might be a topical cream or roll-on, a subcutaneous injection, or, more recently, a sublingual lozenge. There’s bountiful evidence of this method’s potential for success, but there’s also a tremendous risk factor, especially compared to clomiphene and supplements.
Research indicates that patients receiving exogenous testosterone experience a range of adverse effects, including an increased risk of heart attack and stroke. About one in 10 patients will develop a blood disorder — polycythemia — after the first year.²²
Given these risks, we consider testosterone replacement therapy the least advisable route and a last resort for men looking to increase low testosterone levels.
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Wankhede, S., Mohan, V., & Thakurdesai, P. (2016). Beneficial effects of fenugreek glycoside supplementation in male subjects during resistance training: A randomized controlled pilot study. Journal of Sport and Health Science, 5(2), 176-182.
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Guay, A., Jacobson, J., Perez, J., Hodge, M.B., Velasquez, E. (2003). Clomiphene increases free testosterone levels in men with both secondary hypogonadism and erectile dysfunction: who does and does not benefit? Int J Impot Res 15, 156–165.
Ory, J., Nackeeran, S., Balaji, N. C., Hare, J. M., & Ramasamy, A. R. (2022). Secondary Polycythemia in Men Receiving Testosterone Therapy Increases Risk of Major Adverse Cardiovascular Events and Venous Thromboembolism in the First Year of Therapy. The Journal of urology, 207(6), 1295–1301.