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Not medical advice. The Atlas is not a substitute for a clinician who can examine you.

Fertility Supplement Products

FertilAid, Coast Science Male Fertility, CoQ10 / L-carnitine Brands

Evidence grade 2 of 5, Thin. Read how the Atlas grades evidence.

The written rationale for this grade is still being prepared.

FDA
Not FDA-approved; sold as dietary supplements

Reference only. Not medical advice.

What can go wrong

Generally well tolerated, but high-dose antioxidant 'mega-dosing' is theorized to risk reductive stress, and supplements are not standardized or FDA-approved for infertility. The larger risk is opportunity cost, relying on supplements can delay a proper evaluation of treatable causes (varicocele, hormonal, obstruction).

This is something to take to a clinician. The Atlas can tell you what is known about fertility supplement products in general. It cannot tell you what is happening in your body, and the difference matters most for exactly the symptoms that bring people to this page.

A consumer category of multi-ingredient male-fertility supplements (FertilAid, Coast Science Male Fertility MFSg5, Fertinatal, Proxeed, plus standalone CoQ10 and L-carnitine brands) marketed to improve sperm count and motility. While some small trials report improvements in semen parameters with CoQ10 or L-carnitine, the rigorous MOXI randomized trial found no benefit on semen quality, DNA integrity, or pregnancy and live-birth rates, a major caveat to the marketing.

A crowded antioxidant shelf, and a landmark trial that found no benefit.

What people take it for

These are the reasons people give for taking it. They are not effects it has been shown to have.

  • Idiopathic oligoasthenozoospermia (marketed)
  • General 'sperm health' support (marketed)
  • Adjunct during fertility attempts (marketed)

How it is supposed to work

The stated rationale is reducing oxidative stress: reactive oxygen species can damage sperm membranes and DNA, and antioxidants (CoQ10, vitamins C and E, selenium, lycopene) plus carnitines and zinc are proposed to counter this and support spermatogenesis. The mechanism is plausible, but plausible mechanism has not consistently translated into improved pregnancy or live-birth outcomes.

The antioxidant-evidence reality

Individual small RCTs and meta-analyses report that CoQ10 can raise concentration and motility and L-carnitine can improve motility in idiopathic cases, and these are the studies brands cite. But the multicenter, double-blind MOXI trial, designed around a clinically meaningful endpoint, found the antioxidant formulation did not improve semen parameters, DNA fragmentation, or live-birth rates. Cochrane reviews of antioxidants for male subfertility have repeatedly flagged low-quality evidence and high uncertainty. The honest summary: improvement on a lab number is not the same as a baby, and the best-designed pregnancy-endpoint trial was negative.

What people get wrong

  • Often saidThese supplements are clinically proven to boost fertility

    ActuallyThe strongest pregnancy-endpoint trial (MOXI) found no benefit on semen quality or live birth. Improvements in individual studies are mostly on lab parameters, not births, and evidence quality is low.

  • Often saidIf it improves my sperm count number, it improves my odds of a baby

    ActuallySemen-parameter changes do not reliably predict pregnancy. Brands cite parameter studies; outcome trials are far less encouraging.

Who profits, and who pushes back

Nobody is named here yet, because we have not done that work on this entry. Read that as unfinished. Somebody almost certainly sells this, and somebody almost certainly disputes it. Assume both until we have checked.

What we do not know

  • Is there a definable subgroup (e.g., documented high oxidative stress) that genuinely benefits?
  • Why do parameter improvements so often fail to translate into live births?

The market for this

What follows describes how this is bought and sold. It is not a buying guide and it is not an endorsement of any seller.

Typically $20-$60 per month per product, often taken for 3+ months (a spermatogenesis cycle) and frequently stacked, raising real monthly spend.

At a glance

Common ingredients
L-carnitine, CoQ10, zinc, folic acid, vitamins C and E, selenium, lycopene
MOXI result
No improvement in semen parameters or live birth
Regulatory status
Dietary supplements, not FDA-approved for infertility

What this entry does not yet cover

What follows is unfinished work on our side, not a finding about Fertility Supplement Products. A short entry is not a safe entry.

  • Timeline. We have not built the dated record of research and regulatory events.
  • Supply chain. We have not mapped where it is made.
  • Who uses it. We have not documented the user groups.
  • What could change. No forward-looking summary yet.
  • How it compares. We have not set it against the alternatives.
  • Children and teenagers. We have not checked what is known about younger people.

Sources

The studies below are named and described, but not linked. You cannot open them from here and check our reading against them, which means this page is our summary of the literature rather than a document you can verify. Weigh it accordingly until the links exist.

The studies that matter

  • MOXI randomized clinical trial (Steiner et al., Fertility and Sterility)2020

    174 men, 9 US centers; antioxidant formula (vitamin C, E, selenium, L-carnitine, zinc, folic acid, lycopene) did not improve semen parameters, DNA integrity, or pregnancy/live-birth vs placebo

  • CoQ10 systematic review (PMC8226917)2021

    Reported improvements in concentration and motility but noted heterogeneity and absence of robust live-birth data

  • L-carnitine reviewsvarious

    Mixed signal for motility in idiopathic cases; inconsistent effect on pregnancy