Quick answer: Results depend on your starting point. Men with hormonal decline, cardiovascular risk factors, or zinc deficiency have the strongest evidence behind them. Healthy men with normal baselines are less likely to notice a significant difference.
Supplement labels can be ambitious. The science behind them is usually more complicated. This article breaks down what the research actually shows for each product in this bundle so you can decide whether it fits your situation.
DHEA Testosterone Support
What Is DHEA?
DHEA (dehydroepiandrosterone) is a hormone your adrenal glands produce naturally. Your body uses it as a raw material to make testosterone and estrogen. Levels peak in your mid-20s and fall steadily after that, dropping as much as 80% by age 75.
For men in that decline, supplementing makes biological sense.
What Does the Research Show?
A meta-analysis found that DHEA supplementation produced a statistically significant increase in testosterone, with an average increase of 28.02 ng/dL across all participants. That’s meaningful evidence from a large, well-designed body of research.
Dosage and duration matter. The analysis found stronger results with doses above 50 mg/day. Men with documented hormonal decline tend to see the most benefit.
Who Benefits Most from DHEA?
The strongest case for DHEA is older men whose levels have measurably dropped. In a study of 23-year-old men doing resistance training, DHEA supplementation didn’t significantly increase testosterone or improve strength compared to placebo, which suggests the hormone is most useful when there’s an actual deficiency to address.
Mayo Clinic notes that DHEA may carry risks for men with elevated cancer risk, particularly prostate cancer, and recommends talking to your doctor before starting. That’s a reasonable step for anyone with a personal or family history worth flagging.
If you’re an older man with signs of hormonal decline, this product has solid scientific backing. If your hormones are in normal range for your age, the evidence for a meaningful boost is thinner.
Source: Meta-analysis of 42 RCTs
Nitric Oxide Support
What Is Nitric Oxide?
Nitric oxide (NO) is a molecule your body makes on its own. It plays a central role in your body’s ability to achieve erections.
How It Works
When sexual stimulation occurs, nerve terminals and endothelial cells in the penis release NO, which triggers smooth muscle relaxation and allows blood to flow in, resulting in an erection. It’s the same pathway PDE5 inhibitors like Viagra work through.
What the Research Shows
A meta-analysis of 10 randomized controlled trials involving 540 patients found that arginine supplementation at doses between 1,500 and 5,000 mg significantly improved erectile dysfunction compared to placebo, with improvements in erectile function, intercourse satisfaction, and orgasmic function scores.
A separate study found that L-citrulline at 1.5 g per day improved erection hardness in men with mild erectile dysfunction and was well tolerated with no adverse events.
Who Benefits Most from Nitric Oxide?
A study published in Andrology found that men with severe erectile dysfunction had significantly lower L-arginine and L-citrulline levels than men with mild ED, particularly in cases with arteriogenic origins, which is dysfunction caused by restricted arterial blood flow.
Men with cardiovascular risk factors like elevated cholesterol, hypertension, or diabetes are the most likely to see meaningful results. For men with healthy vascular function and no erectile concerns, the expected effect is smaller.
CAUTION: Men taking nitrates for heart conditions should not combine them with NO-boosting supplements due to the combined effect on blood pressure. Check with your doctor first if you’re on any cardiovascular medications.
Semen Volume Maximizer
What Does Semen Volume Maximizer Do?
The Firehose Semen Volume Maximizer combines zinc, lecithin, L-arginine, and herbal extracts. Each ingredient has a biological rationale. The evidence behind them, though, ranges from credible to largely anecdotal.
Zinc: The Main Ingredient
Zinc has the most research support of anything in this formula. A systematic review and meta-analysis found that infertile men had significantly lower zinc concentrations in seminal plasma than fertile controls, and that zinc supplementation was associated with increased semen volume, sperm motility, and normal morphology in infertile men.
A controlled depletion study also found that men eating very low-zinc diets showed measurable reductions in both semen volume and testosterone, which points to zinc’s role in preventing decline rather than pushing above a healthy baseline.
One important counterpoint: a large randomized trial involving 2,370 men found that zinc and folic acid supplementation did not significantly improve sperm parameters compared to placebo in a general infertility population. That’s a rigorous study, and it suggests zinc matters most when there’s a deficiency driving the problem.
If you have documented zinc deficiency or diagnosed fertility concerns, the evidence is solid. For men with adequate zinc levels, the expected effect is smaller.
Maca Root: The Libido Lifter
Maca (Lepidium meyenii) is a root vegetable native to the high-altitude Andes of Peru. It has been used traditionally for centuries to support energy and reproductive health. In supplement form, it’s typically sold as a powder or capsule.
Unlike DHEA and L-arginine, maca doesn’t work by directly raising hormone levels or altering vascular function. Its mechanism isn’t fully understood, but the libido benefit appears to operate independently of testosterone.
What the Research Shows
A 12-week double-blind, placebo-controlled trial in men aged 21–56 found that maca improved self-reported sexual desire starting at 8 weeks of treatment. Notably, testosterone and estradiol levels were unchanged, meaning the effect on libido was independent of hormonal shifts.
A separate pilot study found that participants on higher-dose maca showed significant improvements in sexual function scores and reported more frequent attempts at sexual activity compared to placebo. Libido improved significantly in both the intent-to-treat and completer groups.
A 2022 systematic review covering human and animal studies noted that 55 of 57 studies reported some positive effect from maca, but also concluded that more rigorous clinical trials are needed before firm recommendations can be made.
Maca is generally well tolerated. Mild gastrointestinal discomfort is the most commonly reported side effect. Men with thyroid conditions should be aware that maca contains goitrogens, compounds that can interfere with thyroid function at high doses, and should check with their doctor before starting.
Who Benefits Most from Maca Root?
If you’re looking for support with sexual desire rather than testosterone levels or circulation, you’re more likely to see a positive result from Semen Volume Maximizer.
L-arginine and L-citrulline: Amino Acids
This product also contains l’arginine and L-citrulline, two amino acids your body uses to make nitric oxide. They are also included in both the Semen Volume Maximizer product below, where they serve a similar purpose: They support blood flow to the penis, which may have a positive effect on sexual function.
If your circulation is already healthy, your body is likely producing as much NO as it needs, and adding more of the raw material probably won’t change much.
But if you have cardiovascular risk factors or known circulation issues, you’re more likely to see a real difference.
Who Will Benefit Most From the Men’s Health Bundle with Semen Volume Maximizer?
DHEA Testosterone Support is best matched to older men with documented hormonal decline. The evidence for meaningful testosterone increases in otherwise healthy men is weaker, and a conversation with your doctor before starting is worth the time.
Nitric Oxide Support is most relevant for men with cardiovascular risk factors, elevated cholesterol, or known circulation concerns. For men with healthy vascular function, the expected benefit is modest.
Semen Volume Maximizer’s strongest ingredient is zinc, which is particularly helpful for men with zinc deficiency or fertility concerns. The maca root has also been shown to increase libido.
If reproductive health is your main goal, a urologist visit before purchasing supplements is the most productive first step.
The Bottom Line
The ingredients in this bundle target real biological pathways. How much they help depends on where you’re starting from. Men with hormonal decline, cardiovascular risk factors, or documented zinc deficiency have the most to gain.
Healthy men with no underlying issues may see less dramatic results.
The best way to find out how these supplements can help you is to see for yourself. Explore our full range of male enhancement products, where you can also buy the individual components of this package individually.
For products that interact with hormones or reproductive health, a quick check-in with your doctor (or one of ours) will help you match the right product to your actual needs.
References
Baig, M., et al. (2020). Effects of DHEA supplementation on testosterone levels: A meta-analysis of 42 randomized controlled trials. PubMed. https://pubmed.ncbi.nlm.nih.gov/33045358/
Brown, G.A., et al. (1999). Effect of oral DHEA on serum testosterone and adaptations to resistance training in young men. Journal of Applied Physiology, 87(6), 2274–2283. https://journals.physiology.org/doi/full/10.1152/jappl.1999.87.6.2274
Mayo Clinic. (n.d.). DHEA: Overview, uses, side effects, and safety. https://www.mayoclinic.org/drugs-supplements-dhea/art-20364199
Mitrovic, M., et al. (2025). Nitric oxide and vascular health. Nutrients, 17(4), 665. https://www.mdpi.com/2072-6643/17/4/665
Creager, M.A., et al. (1992). L-arginine improves endothelium-dependent vasodilation in hypercholesterolemic humans. Journal of Clinical Investigation. https://pubmed.ncbi.nlm.nih.gov/1401062/
Böger, R.H., et al. (1998). Restoring vascular nitric oxide formation by L-arginine improves the symptoms of intermittent claudication in patients with peripheral arterial occlusive disease. Journal of the American College of Cardiology. https://pubmed.ncbi.nlm.nih.gov/9809945/
Liu, T.H., et al. (2012). No effect of short-term arginine supplementation on nitric oxide production in healthy male athletes. PubMed Central. https://pmc.ncbi.nlm.nih.gov/articles/PMC3489573/
Li, J., et al. (2016). Zinc and semen quality: A systematic review and meta-analysis. Scientific Reports. https://pmc.ncbi.nlm.nih.gov/articles/PMC4773819/
Netter, A., et al. (1981). Effect of zinc administration on plasma testosterone, dihydrotestosterone, and sperm count. American Journal of Clinical Nutrition. https://pubmed.ncbi.nlm.nih.gov/1609752/
Schisterman, E.F., et al. (2020). Effect of folic acid and zinc supplementation in men on semen quality and live birth among couples undergoing infertility treatment. JAMA, 323(1), 35–48. https://pubmed.ncbi.nlm.nih.gov/31910279/
Gao, Y., et al. (2022). Effects of dietary lecithin on semen quality in roosters. PubMed Central. https://pmc.ncbi.nlm.nih.gov/articles/PMC8749332/
Healthline. (n.d.). Does lecithin increase semen volume? https://www.healthline.com/health/mens-health/lecithin-semen
Dr. Oracle. (n.d.). Can lecithin supplements increase semen volume? https://www.droracle.ai/articles/530408/can-lecithin-supplements-increase-semen-volume
Inverse. (n.d.). The supplement stack guys swear by for semen volume, explained. https://www.inverse.com/mind-body/60428-cum-holy-grail-supplement-semen-recipe
Disclaimer: This article provides general information about health and related topics but is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.
Paula Clark worked in the healthcare industry for 17 years before becoming a full-time freelance health and medical writer. Her clients appreciate her ability to convey complex information in terms laypeople can understand. Paula prides herself on the depth and accuracy of her research. Her goal is to add authority to your site in words that will delight both Google and your readers.