Dark Labs - Devil Test - 180 Capsules

Dark Labs Devil Test is a natural testosterone support supplement formulated for adult men who want to support hormone balance, training performance, and physical conditioning through evidence-informed ingredients. Combining KSM-66® Ashwagandha, Fadogia Agrestis, Tongkat Ali, Epicatechin, and DIM across a 6-capsule daily serving, it takes a multi-pathway approach to male performance support in a 180-capsule, 30-serving bottle.

What Is Dark Labs Devil Test?

Devil Test is a natural hormone support supplement from Dark Labs, designed specifically for adult men. It is positioned within Dark Labs' men's performance range as a daily-use formula built around eight active ingredients targeting testosterone support, stress hormone management, estrogen balance, and muscle performance support.

It comes in a 180-capsule bottle delivering 30 servings at 6 capsules per serving, a full month's supply at the standard dose.

Important context before reading further: Devil Test is a dietary supplement. It is not a pharmaceutical, not a form of testosterone replacement therapy, and is not intended to diagnose or treat any medical condition, including low testosterone. If you have concerns about your testosterone levels from a medical standpoint, a conversation with a licensed healthcare professional and appropriate blood testing is the correct first step.

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Full Ingredient Breakdown

Serving Size: 6 capsules | Servings: 30

Fadogia Agrestis Extract 10:1 - 600mg

Fadogia Agrestis is a plant extract from West Africa that has received significant attention in the testosterone support category, largely driven by popular discussion in the fitness and health podcasting space.

The research context is important to understand honestly: the existing evidence on Fadogia Agrestis is based on animal studies, not human clinical trials. Rodent studies have shown promising signals, including dose-dependent increases in testosterone markers. However, the translation from animal research to human outcomes is not established, and no peer-reviewed human clinical trials have been published to date.

At higher doses in animal research, potential cytotoxic effects on testicular, kidney, and liver tissue have been noted. Based on this, some researchers recommend cycling Fadogia Agrestis rather than using it continuously; a 3-week-on, 1-week-off approach is commonly cited as a precaution. Devil Test users who choose to follow this practice should plan their 30-day supply accordingly.

KSM-66® Ashwagandha - 500mg

KSM-66® is a patented, clinically studied form of ashwagandha (Withania somnifera) root extract, the most widely researched ashwagandha extract available. Unlike generic ashwagandha powders, KSM-66® is standardised to a specific withanolide content and has been the subject of multiple peer-reviewed human clinical trials.

Research on KSM-66® has examined its effects on cortisol levels, stress response, and testosterone markers in men. One double-blind, placebo-controlled study found statistically significant increases in testosterone levels in the KSM-66® group compared to placebo in healthy adult males. Another study in resistance-trained men reported a meaningfully greater increase in total serum testosterone in the ashwagandha group.

The mechanism is well-understood: high cortisol chronically suppresses testosterone production through the hypothalamic-pituitary-gonadal axis. By supporting the body's stress response and helping moderate cortisol levels, ashwagandha may indirectly create a more favourable hormonal environment for testosterone. This is why adaptogens belong in a testosterone support formula, not as a direct stimulator, but as a stress-hormone regulator.

At 500mg of KSM-66®, which aligns with clinically studied doses, this is one of the better-dosed ashwagandha inclusions in this category.

Epicatechin - 300mg

Epicatechin is a flavonoid found naturally in dark chocolate and green tea. It has attracted interest in the sports nutrition space primarily for its relationship with myostatin, a protein that regulates and limits muscle growth.

Preclinical research and some early human investigations have examined whether epicatechin supplementation may influence myostatin activity, with the hypothesis that reduced myostatin could support a more favourable anabolic environment. It is important to note that this research is still in early stages; the effects seen in cell and animal studies have not been fully replicated in robust human clinical trials.

Epicatechin also has a separate body of research examining its effects on nitric oxide production and vascular function, which may contribute to training performance independently.

Boron Citrate - 200mg

Boron is a trace mineral that has been examined in the context of free testosterone and sex hormone-binding globulin (SHBG). SHBG binds to testosterone in the bloodstream, rendering it biologically inactive. Some research suggests that boron supplementation may support a reduction in SHBG levels, potentially increasing the ratio of free to bound testosterone.

Human studies on boron and testosterone exist, though the evidence is not uniformly conclusive. The inclusion of 200mg provides a meaningful dose within the range examined in this research.

DIM (Diindolylmethane) - 200mg

DIM is a compound produced in the body when cruciferous vegetables - broccoli, Brussels sprouts, cauliflower - are digested. It is included in testosterone support formulas primarily for its role in estrogen metabolism.

DIM influences the balance between more and less active estrogen metabolites. Some research suggests it may support a more favourable estrogen ratio in men, which is relevant because excess estrogen in male physiology can compete with testosterone at receptor sites. The evidence base here is primarily in vitro and early-stage human research rather than large-scale clinical trials.

Tongkat Ali Extract 200:1 - 150mg

Tongkat Ali (Eurycoma Longifolia) is one of the more researched herbal testosterone support ingredients available. The 200:1 extract ratio means this dose is equivalent in concentration to 30,000mg of standard root powder, a highly concentrated form delivering more active compounds per milligram than lower-ratio extracts.

Tongkat Ali has human clinical research behind it. Studies have examined its effects on free and total testosterone, luteinising hormone (LH), and male vitality markers. The evidence quality is moderate, results are generally positive, but study sizes are often small. At a concentrated 200:1 ratio, even 150mg represents a meaningful amount of active material.

AstraGin® - 50mg

AstraGin® is a patented bioavailability-enhancing compound derived from Astragalus and Panax notoginseng. It is included specifically to improve the absorption of the other active ingredients in the formula at the intestinal level, helping more of what you take actually reach systemic circulation rather than being poorly absorbed and excreted. Patented forms like AstraGin® have published absorption studies backing their inclusion.

BioPerine® - 10mg

BioPerine® is a patented black pepper extract standardised to 95% piperine. It works through a similar mechanism to AstraGin®, enhancing the bioavailability of co-administered nutrients by inhibiting certain metabolic enzymes and increasing intestinal absorption. Multiple studies support piperine's bioavailability-enhancing properties across a range of compounds. At 10mg, this is the standard clinically examined dose.

Quick Take - Formula Design

• KSM-66® and Tongkat Ali have the strongest human clinical evidence of any ingredient in this formula
• Fadogia Agrestis currently has animal study data, but no human trials have been published
• Epicatechin evidence is promising but primarily preclinical for the myostatin angle
• AstraGin® and BioPerine® are both patented, studied bioavailability enhancers; their inclusion meaningfully improves the practical value of the rest of the formula
• DIM supports estrogen metabolism support; Boron targets SHBG and free testosterone ratios

How Devil Test approach hormone support?

Devil Test does not take a single-pathway approach. It targets multiple points in the hormonal environment simultaneously:

Cortisol Management → KSM-66®
Chronic stress elevates cortisol, and high cortisol is directly associated with suppressed testosterone production. By addressing the cortisol side of the equation through a well-researched adaptogen, the formula aims to reduce one of the most common physiological barriers to healthy testosterone levels in active men.

Direct Testosterone Support → Fadogia Agrestis + Tongkat Ali
Both ingredients are included for their historically reported and researched associations with testosterone and luteinising hormone activity. Tongkat Ali has stronger human evidence base; Fadogia Agrestis has generated significant interest from animal research.

Free Testosterone Optimisation → Boron Citrate
Supporting a reduction in SHBG may help shift more total testosterone into the free, biologically active form, the form that actually acts on receptor sites in muscle, brain, and other tissues.

Estrogen Balance → DIM
Managing the ratio of estrogen metabolites may support a more favourable hormonal environment for male physiology, particularly relevant for men in caloric surplus phases or with higher body fat.

Muscle Performance Support → Epicatechin
Targeting myostatin-related pathways may support a more anabolic training environment independently of the testosterone-focused ingredients.

Absorption Maximisation → AstraGin® + BioPerine®
Both patented bioavailability agents ensure the active compounds in the formula are absorbed effectively, an often-overlooked factor that determines the real-world difference between a formula that works and one that passes through largely unabsorbed.

Quick Take

• Multi-pathway approach: cortisol, testosterone, free testosterone ratio, estrogen balance, and muscle performance support
• Not a single-ingredient formula depending on one mechanism
• Bioavailability stack included - a meaningful addition that most competitors skip
• This is a support supplement - results build over weeks of consistent use, not days

What Realistic Expectations Look Like?

This is a conversation almost no testosterone supplement page has honestly.

Devil Test is a natural dietary supplement. It works with your body's existing hormonal systems; it does not override them, replace them, or work at the speed or magnitude of pharmaceutical testosterone therapy.

For healthy adult men using Devil Test consistently alongside a structured training program and appropriate nutrition:

• Most users report that noticeable changes take 4-8 weeks of consistent daily use
• Energy levels and general mood are often the first things users notice shifting
• Training performance and recovery changes typically follow over subsequent weeks
• Body composition changes, where they occur, are gradual and depend heavily on diet and training consistency

Setting realistic expectations protects you from disappointment and helps you evaluate the product fairly. Natural testosterone support supplements are not a substitute for the fundamentals; sleep quality, caloric adequacy, resistance training, and stress management are all more impactful on testosterone than any supplement.

Who is the Devil Test Designed For?

Well-suited for:

• Adult men 18+ who want a multi-ingredient natural testosterone support formula
• Men in physically demanding training phases seeking hormonal and recovery support
• Those who want to support energy, drive, and performance through a natural daily supplement
• Men whose lifestyle involves high stress, where cortisol management via KSM-66® is particularly relevant

Not appropriate for:

• Anyone under 18 hormone-influencing supplements are not appropriate for minors
• Women, this formula is designed specifically for male physiology
• Pregnant or nursing individuals
• Anyone with existing hormonal conditions, prostate issues, or hormone-sensitive conditions without prior physician clearance
• Men currently using testosterone replacement therapy or any prescribed hormone medication without explicit physician guidance
• Anyone with liver or kidney conditions - given the limited long-term safety data on Fadogia Agrestis, particularly

If you have been diagnosed with clinically low testosterone (hypogonadism) or are being treated by a physician for any hormonal condition, speak with your healthcare provider before adding any dietary supplement to your routine.

How to Take the Devil Test?

As per Dark Labs' stated directions:

• Take 6 capsules daily, preferably with a meal
• Consistent daily use is necessary; skipping doses reduces the cumulative benefit of adaptogens and herbal extracts that build over time
• Do not exceed the recommended serving

Cycling consideration for Fadogia Agrestis:

Given the limited long-term human safety data on Fadogia Agrestis, a 3-week-on, 1-week-off cycling approach is a precaution many users choose to adopt. One 30-serving container used at the standard dose covers 30 days; users following a cycle protocol would take a week off between bottles. This is a user discretion decision; consult your healthcare professional if you are unsure about the right approach for your circumstances.

Safety and Precautions

Fadogia Agrestis safety note: Long-term human safety data for Fadogia Agrestis do not yet exist. Animal studies have flagged potential cytotoxic effects at high doses on testicular, kidney, and liver tissue. At 600mg of a 10:1 extract, this is a meaningful dose. Users with any existing liver or kidney conditions should not use this product without a physician's clearance.

Hormonal interaction: Men on prescribed hormone medications, including testosterone replacement therapy, should consult their prescribing physician before adding any natural hormone support supplement.

Medication interactions: Ashwagandha has documented interactions with thyroid medications, immunosuppressants, and sedatives. If you take any of these medications, speak with your healthcare provider before use.

Prostate health: Men with a history of prostate conditions should consult a physician before using any testosterone support supplement.

Stop use and consult a healthcare professional if you notice any unexpected changes in mood, energy, or physical symptoms after beginning this supplement.

This product is not intended to diagnose, treat, cure, or prevent any disease or medical condition.

Where Devil Test Fits in Your Stack?

Devil Test is designed as a daily foundational support supplement, not an acute pre-training product.

It pairs well with:

• A structured resistance training program is the context in which testosterone support supplements are most relevant
• Protein supplementation post-training to support muscle protein synthesis
• Creatine, as a performance foundation, has no hormonal activity and stacks cleanly with any daily supplement
• Quality sleep and stress management genuinely the two most impactful natural levers on testosterone levels in adult men

Dark Labs recommends stacking Devil Test with their Uzbek Turkesterone or Alpha Creatine for a more complete performance support approach. Browse our testosterone and men's performance supplements collection for compatible options.

Quick Take

• Take daily with food - this is a slow-build formula, not an acute supplement
• Stack with protein and creatine for a complete performance foundation
• Sleep quality and stress management will always be the largest natural levers on testosterone
• Allow 4-8 weeks of consistent use before evaluating results

Frequently Asked Questions

1. What is Dark Labs Devil Test used for?

Devil Test is a natural dietary supplement designed to support male hormone balance, energy, and training performance. It uses a multi-ingredient formula targeting cortisol management, testosterone support, free testosterone optimisation, and estrogen balance through eight active ingredients. It is a dietary supplement, not a pharmaceutical, and not a form of testosterone replacement therapy.

2. Does Devil Test actually increase testosterone?

Devil Test contains ingredients that have been studied in the context of male hormone support. KSM-66® Ashwagandha has the strongest human clinical evidence of any ingredient in the formula, with studies showing meaningful differences in testosterone markers versus placebo. Tongkat Ali also has moderate human research supporting its use. Fadogia Agrestis, while widely discussed, currently has animal study data only, with no published human clinical trials. These statements have not been evaluated by the FDA.

3. How long does it take for Devil Test to work?

Natural testosterone support supplements work gradually rather than acutely. Most users report noticeable changes in energy and drive after 3-4 weeks of consistent daily use, with more significant shifts in training performance and physical condition becoming apparent after 6-8 weeks. Inconsistent dosing significantly reduces the cumulative benefit of adaptogen and herbal extract formulas. One full bottle covers 30 days of consistent use.

4. Should Fadogia Agrestis be cycled?

Based on the available animal research, which has flagged potential toxicity concerns at high doses with prolonged continuous use, many practitioners recommend cycling Fadogia Agrestis rather than using it indefinitely. A common approach is 3 weeks on, 1 week off. Since one bottle of Devil Test covers 30 days, users who follow this practice take a break between bottles. This is a precautionary recommendation; consult your healthcare professional for personalised guidance.

5. Is Devil Test safe for long-term use?

The safety profiles of the individual ingredients vary. KSM-66® Ashwagandha, Tongkat Ali, DIM, Boron, Epicatechin, AstraGin®, and BioPerine® have generally favourable safety profiles based on available research. Fadogia Agrestis is the ingredient with the least established long-term safety data in humans. Anyone with liver, kidney, or hormonal conditions should consult a healthcare professional before using this product.

6. Can women use the Devil Test?

No. The Devil Test is formulated specifically for male physiology. The ingredients target male hormone pathways, including testosterone and male-pattern estrogen balance. It is not appropriate for women, and particularly not for pregnant or nursing individuals.

7. Can I use Devil Test if I am on testosterone replacement therapy?

Anyone on prescribed hormone therapy, including TRT, should not add any testosterone support supplement to their routine without explicit guidance from their prescribing physician. The interaction between natural hormone-influencing ingredients and exogenous testosterone therapy is a clinical question that requires medical supervision.

8. What do AstraGin® and BioPerine® actually do?

Both are patented bioavailability-enhancing ingredients that help the body absorb more of the active compounds from the rest of the formula. AstraGin® works at the intestinal transporter level; BioPerine® inhibits metabolic enzymes that can break down certain compounds before they are absorbed. Without them, a meaningful portion of the active ingredients in a capsule formula can pass through partially unused. Their inclusion is a sign of formal attention to detail.

9. How does KSM-66® differ from regular ashwagandha?

KSM-66® is a patented, full-spectrum ashwagandha root extract standardised to a guaranteed withanolide content and backed by multiple published human clinical trials. Generic ashwagandha powder has no standardisation guarantee, meaning the active compound content varies batch to batch. The clinical studies that have shown testosterone-supportive effects used standardised extracts like KSM-66®; results from those studies cannot be assumed to apply to non-standardised generic ashwagandha.

10. Can Devil Test be stacked with a pre-workout?

Yes. Devil Test is a daily hormonal support supplement taken with food. It has no stimulant content and no compounds that conflict with a standard pre-workout supplement. It can be taken in the morning with breakfast, regardless of when you train. Avoid stacking with other products containing high-dose ashwagandha to stay within sensible daily ranges of that ingredient, and consult a healthcare professional if you are taking any prescription medications before adding any supplement to your routine.

CONCLUSION

You now have a complete and honest picture of what Dark Labs Devil Test is, what the evidence base looks like for each ingredient, what realistic expectations to set, and how to use it safely within a structured training routine. It is a well-constructed, multi-pathway natural supplement for adult men with KSM-66® and Tongkat Ali, providing the strongest clinical backing and Fadogia Agrestis, contributing significant interest from animal research, while human data remains pending. Used consistently for 4-8 weeks alongside proper training, nutrition, and recovery habits, it is one of the more thorough natural testosterone support formulas in this category.

FDA DISCLAIMER

(Place at the bottom of the page, above the reviews section)

Disclaimer: These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease or medical condition. This product is intended for healthy adult men only. Always consult a qualified healthcare professional before beginning any dietary supplement, particularly if you have pre-existing health conditions, take prescription medications, or are being treated for any hormonal condition.