Across decades, male fertility metrics and testosterone levels have been trending downward—and a new supplement company is stepping into a space long neglected by fertility care. SwimClub, a recently launched brand, is offering what it calls the first clinically-formulated male fertility regimen designed to address declining sperm performance and the broader male reproductive health crisis.
A silent epidemic: sperm counts and male fertility decline
Since the 1970s, sperm counts have fallen by roughly 59 percent, while men today typically father their first child about four years later than in 1980. Yet fertility treatments and supplements have overwhelmingly focused on women, leaving male infertility under-resourced and under-attended. SwimClub’s founders view this as a major gap—and one they believe they can help fill.
SwimClub’s flagship product, Spermatogen Complex, was formulated in collaboration with Dr. Michael Eisenberg, Director of Male Reproductive Medicine at Stanford. The supplement is marketed as a single, daily dose combining 12 evidence-based ingredients—such as omega-3 fatty acids, coenzyme Q10, L-carnitine, zinc, folate, and antioxidants—each at doses purportedly shown effective in clinical studies. Its aim is to target all four key sperm parameters: count, motility, morphology, and DNA integrity.
Unlike many fertility supplements that address only one facet—such as motility or morphology—Spermatogen is billed as a comprehensive formula designed to support spermatogenesis (sperm formation), reduce oxidative stress in the testes, and boost cellular energy in germ cells. The company advocates a 90-day course of use—covering the full sperm production cycle—to maximize potential benefits.
SwimClub is the first consumer product launched by Squared Circles, a venture studio backed by L Catterton, which focuses on health and longevity brands. The founders cite their personal fertility journeys—miscarriages, lack of male-centric options, and frustration with pill burden—as triggers for building a solution they wished had existed earlier.
Promise, caution, and the role of “testosterone supplements”
The emergence of SwimClub comes amid broader public interest in male hormonal health, where “testosterone supplements” occupy a controversial and heavily marketed niche. Over-the-counter testosterone boosters (those not requiring prescription) often claim to elevate testosterone and enhance vitality. Yet review studies show minimal consistent evidence that such supplements reliably raise testosterone or yield meaningful clinical outcomes. Many products contain vitamins or herbal ingredients (e.g. fenugreek, zinc, ashwagandha) but lack robust clinical backing.
In fact, experts frequently caution that unregulated testosterone supplements may create false expectations or, worse, interfere with natural hormonal balance. Prescription testosterone replacement therapy (TRT)—used for medically diagnosed low testosterone—carries its own risks, including suppression of sperm production, testicular shrinkage, increased red blood cell counts, and potential cardiovascular or metabolic side effects. Regulatory bodies such as the U.S. FDA in 2025 updated labeling rules for prescription testosterone products, retaining “limitations of use” for age-related declines while adding warnings about elevated blood pressure.
It’s also worth noting that testosterone is intimately tied to fertility biology; using exogenous forms without medical supervision can paradoxically reduce sperm count by suppressing the hypothalamic-pituitary-gonadal axis.
Thus, while SwimClub’s product is not positioned as a “testosterone supplement,” its signaling coincides with growing consumer interest in hormonal wellness. For men exploring fertility support, a product like Spermatogen offers a more targeted approach than blunt hormone boosters—but it still sits in a space where evidence is evolving.
Integrating these trends: opportunities and unanswered questions
SwimClub’s launch is timely. Awareness of male infertility has grown, and men are increasingly encouraged to participate proactively in reproductive health rather than being sidelined as “passive” partners. Supplements that address o average male hormonal or sperm health resonate with that shift.
However, a few key caveats remain:
Clinical evidence gap: While the ingredients in Spermatogen are drawn from existing studies, the combined formulation has not yet published independent, peer-reviewed trials.
Regulatory oversight: As a supplement, not a drug, it won’t go through the rigorous safety and efficacy review that novel pharmaceuticals must undergo.
Interaction with other hormonal strategies: Men considering TRT or hormonal therapies must consult clinicians to avoid counterproductive interactions.
Focus on lifestyle: Diet, exercise, exposure to toxins, obesity, sleep, and stress all influence sperm and hormonal health—no supplement can fully compensate for poor baseline health.
Still, SwimClub marks a milestone: a fertility brand explicitly for men, treating male reproductive decline as a legitimate health category. Its success—or failure—will depend heavily on its ability to deliver measurable results in real people and on the scientific community’s response.
In the broader hormonal health landscape, public scrutiny of testosterone supplements is tightening, and regulation is catching up. As men are empowered to seek support, at least some of the myths around testosterone and fertility may finally be challenged by data and transparency.
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