What is inside the bottle
Apex Boost Ingredients: What Is in Each Serving
Apex Boost contains six herbs in one 838 mg blend per 2-capsule serving.
Tribulus terrestris, horny goat weed, longjack, panax ginseng, ashwagandha and yohimbe are listed in order of weight. The inactive ingredients are silica dioxide, rice flour and magnesium stearate.
For the full panel, see the Supplement Facts label.
The blend, exactly as printed
The Supplement Facts panel gives one active line and no more. Here it is transcribed, with nothing added:
| Line on the panel | Text |
|---|---|
| Serving Size | 2 Capsules |
| Servings Per Container | 30 |
| Proprietary Male Support Blend | 838 mg; the %DV column carries a footnote |
| Listed under the blend | Tribulus Terrestris Extract (Tribulus Terrestris); Horny Goat Weed Extract (Epimedium Sagittatum); Longjack Extract (Eurycoma Longifolia); Ginseng Root Extract (Panax Ginseng); Ashwagandha Extract (Withania Somnifera); Yohimbe Extract (Pausinystalia Yohimbe) |
| Footnote | Daily Value not established (DV) |
| Inactive Ingredients | Silica Dioxide, Rice Flour, Magnesium Stearate |
| Distributed by | Flex University, San Diego CA, 82121 |
The six herbs, one by one
Each entry below gives what the herb is, what the research bodies we cite actually found, and the caution that comes with it. Where we could not find a source we trust, we say that instead of filling the space.
Tribulus Terrestris Extract (Tribulus terrestris)
Tribulus is the first herb printed in the blend, which under FDA labelling rules means it is the heaviest of the six by weight. It is the herb most often sold as a testosterone booster. Memorial Sloan Kettering's herb monograph is blunt about that claim: a tribulus extract used alone "did not improve androgenic status or physical performance among athletes," and the testosterone rises in the literature happened only when tribulus was one part of a combined supplement, so nobody can say which part did the work. Memorial Sloan Kettering Cancer Center, Tribulus terrestris (2026).
| Amount in this bottle | Typical amount in published work | Caution |
|---|---|---|
| Not published | Commonly studied at 250-1,500 mg a day of a standardised extract. | MSK lists case reports of liver and kidney toxicity and one report of priapism, and advises anyone on clopidogrel, diuretics, blood pressure drugs or diabetes drugs to ask a physician first. |
Horny Goat Weed Extract (Epimedium sagittatum)
Epimedium is the herb most people recognise by its common name. The human evidence is thin. Memorial Sloan Kettering states that "scientific evidence to support use of Epimedium is limited. More studies are needed to confirm its safety and efficacy." The one randomised human trial its monograph highlights looked at bone loss in post-menopausal women, not at men's stamina. Memorial Sloan Kettering Cancer Center, Epimedium (2026).
| Amount in this bottle | Typical amount in published work | Caution |
|---|---|---|
| Not published | Human trials are small and mostly use 100-900 mg a day of leaf extract. | MSK says to avoid epimedium if you have heart disease, citing reported tachyarrhythmia and hypomania, and to avoid it with CYP3A4 substrate drugs and with aromatase inhibitors. |
Longjack Extract (Eurycoma longifolia)
Longjack is the ingredient we can say least about, and we would rather say that than fill the gap. We looked for a plain-language reference page on Eurycoma longifolia from NIH, NCCIH or Memorial Sloan Kettering, the three sources we cite elsewhere on this site, and did not find one we could link. So there is no citation under this ingredient. The published human work that does exist is small and mostly funded by extract makers.
| Amount in this bottle | Typical amount in published work | Caution |
|---|---|---|
| Not published | Trials usually run 200-400 mg a day of a water-based root extract. | Because the reference base is thin, treat longjack as the ingredient with the least safety data in this bottle, not the most exciting one. |
Ginseng Root Extract (Panax ginseng)
Panax ginseng has the deepest research file of the six. NCCIH describes the picture as mixed, with most trials small and short, and notes possible modest effects on fatigue, cognition and sexual dysfunction. On the athletic side the NIH Office of Dietary Supplements is clear that ginseng "had no ergogenic effect on such measures as peak power output, time to exhaustion, perceived exertion, recovery from intense activity, oxygen consumption, or heart rate." NCCIH, Asian Ginseng: Usefulness and Safety (2026).
| Amount in this bottle | Typical amount in published work | Caution |
|---|---|---|
| Not published | Most trials use 200-400 mg a day of a standardised root extract. | NCCIH says short-term use up to six months appears safe for most people, that insomnia is the most common complaint, and that ginseng can interact with medicines. |
Ashwagandha Extract (Withania somnifera)
Ashwagandha is the herb in this blend with the clearest, narrowest evidence. NCCIH reports that some preparations "may be effective for insomnia and stress," while the evidence for anxiety and most other uses stays unclear. That matters for how you read this product: the stress and sleep angle is better supported than the performance angle, and better sleep is a very ordinary reason a man feels sharper after a few weeks. NCCIH, Ashwagandha: Usefulness and Safety (2026).
| Amount in this bottle | Typical amount in published work | Caution |
|---|---|---|
| Not published | Trials typically use 250-600 mg a day of root extract, often for 8-12 weeks. | NCCIH notes drowsiness and digestive upset, rare liver injury, and that safety past about three months is not established. |
Yohimbe Extract (Pausinystalia yohimbe)
Yohimbe is printed last, so it is the smallest of the six by weight, and that is the only good news in this paragraph. NCCIH states that "there is not enough evidence for definite conclusions to be reached about yohimbe's effectiveness for any health condition," and lists cardiac arrhythmia, blood pressure problems, heart attacks and seizures among reported harms. Poison control calls describe stomach upset, rapid heartbeat and anxiety. NCCIH, Yohimbe: Usefulness and Safety (2026).
| Amount in this bottle | Typical amount in published work | Caution |
|---|---|---|
| Not published | Bark extracts vary wildly in yohimbine content, which is why dose ranges are not meaningful. | Do not combine yohimbe with an MAO inhibitor or a tricyclic antidepressant. If you take blood pressure medicine, have a heart rhythm problem, or have an anxiety disorder, talk to your clinician before you open this bottle. |
What the order of the list tells you
Under FDA labelling rules the ingredients inside a proprietary blend must appear in descending order of weight, even when the amounts stay private. That single rule is the only quantitative information this label gives you, so it is worth using.
| Position | Herb | What you can conclude |
|---|---|---|
| 1 | Tribulus terrestris | The largest share of the 838 mg. |
| 2 | Horny goat weed | Second largest. Could be 200 mg, could be 30 mg. |
| 3 | Longjack | Middle of the pack. |
| 4 | Panax ginseng | Below longjack. |
| 5 | Ashwagandha | Second smallest, which is unfortunate given it has the best evidence of the six. |
| 6 | Yohimbe | The smallest share. Given yohimbe's safety record, the right end of the list. |
Two readings come out of that table. The good one: the riskiest herb is the smallest. The bad one: the best-supported herb is second smallest, and the largest share goes to the herb the NIH says showed "no effect on strength, lean body mass, or sex hormone levels".
Inactive ingredients
Silica dioxide
An anti-caking agent. It keeps the powder from clumping so each capsule fills evenly. Common across the supplement industry.
Rice flour
A filler. It takes up the space the actives do not, so a capsule holds a consistent volume. It also makes this formula unsuitable if you avoid rice.
Magnesium stearate
A lubricant that stops powder sticking to the capsule machine. Used in tiny quantities.
There is no capsule-shell ingredient printed on the label, which means the site cannot tell you whether the shell is gelatin or vegetarian cellulose. The brand's panel carries a 100%% Natural mark and a Gluten Free mark, but neither of those answers the gelatin question. It is on our missing list.
What the label does not tell you
Five details the label leaves out
Per-herb milligrams. Extract ratios, such as 10:1 or 4:1. Standardisation, such as the yohimbine percentage in the yohimbe or the withanolide percentage in the ashwagandha. Whether the capsule shell is vegetarian. The name of the lab behind the Third Party Tested mark on the bottle.
None of those gaps is unusual for a proprietary blend, and none of them is illegal. They are simply the price of buying a blend instead of a disclosed formula, and you should know you are paying it. If that trade is not one you want to make, a disclosed-dose product is the better buy and we would rather say so here than pretend otherwise. Our dosage comparison sets it out in a table.
Ingredient questions
Does Apex Boost contain yohimbe?
Yes. Yohimbe extract (Pausinystalia yohimbe) is the sixth and last herb in the blend, so it is the smallest share of the 838 mg. It still carries the strongest cautions of the six.
How much tribulus is in Apex Boost?
Not published. Tribulus is listed first, so it is the largest share of the 838 mg blend, but the label prints no number for it.
Is Apex Boost gluten free?
The brand's product panel carries a Gluten Free mark. The bottle label itself does not repeat it, so treat the panel as the source for that claim.
Is the capsule shell vegetarian?
Not published. The label names three inactive ingredients and does not describe the shell.
Are the herbs standardised extracts?
The label says "Extract" after each herb but gives no ratio or standardisation percentage, so there is no way to compare strength with a studied extract.
Can I take Apex Boost with other supplements?
Talk to your clinician first, particularly if anything else you take is stimulant-like or affects blood pressure. Yohimbe is the ingredient that makes stacking a question worth asking.
References
- NCCIH, National Institutes of Health (2026). Ashwagandha: Usefulness and Safety.
- NCCIH, National Institutes of Health (2026). Asian Ginseng: Usefulness and Safety.
- NCCIH, National Institutes of Health (2026). Yohimbe: Usefulness and Safety.
- Memorial Sloan Kettering Cancer Center, About Herbs (2026). Epimedium.
- Memorial Sloan Kettering Cancer Center, About Herbs (2026). Tribulus terrestris.
- Office of Dietary Supplements, National Institutes of Health (2026). Dietary Supplements for Exercise and Athletic Performance: Health Professional Fact Sheet.
See the label before you buy
The panel is on this site. The blend is 838 mg. The window is 60 days.
60-day money-back guarantee · Questions first? The contact page lists both desks