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How to Increase Sperm Count: What Works, According to Science

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Clomiphene Citrate

Clomiphene citrate is a powerful, nonsteroidal Selective Estrogen Receptor Modulator (SERM) used as a first-line, orally administered therapy for treating ovulatory dysfunction in women desiring pregnancy. It works by selectively modulating estrogen receptors to stimulate the hypothalamic–pituitary–ovarian (HPO) axis, leading to follicular growth and subsequent ovulation. Since its FDA approval in 1967, it has been widely used and is also employed off-label in men with secondary hypogonadism.

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What Is a Normal Sperm Count?

“Sperm count” usually means sperm concentration: the number of sperm per milliliter of semen. In the sixth edition of its laboratory manual, the World Health Organization puts the lower reference limit at 16 million per milliliter, with a total of 39 million sperm per ejaculate.

Those figures are not a pass–fail line. They represent the 5th percentile of roughly 3,500 men whose partners conceived within a year, which means 5% of men with proven fertility fall below them. The sixth edition moved away from treating that percentile as a threshold for exactly this reason. A result below the limit does not mean you cannot conceive, and a result above it does not guarantee you will.

Count is also only one measure. A semen analysis reports volume, concentration, motility (the percentage of sperm moving, with a reference limit of 42%), morphology (shape, with a normal limit of 4%), and vitality. Motility and morphology can be abnormal when the count is fine.

What Causes Low Sperm Count?

Medical Causes

A varicocele, an enlargement of the veins draining the testicle, is the most common correctable cause. Others include hormonal disorders, prior infection, obstruction anywhere along the reproductive tract, genetic conditions such as Klinefelter syndrome or Y-chromosome deletions, and prior chemotherapy or radiation. The AUA guideline recommends considering surgical repair for men with a palpable varicocele, infertility, and abnormal semen parameters.

Medications matter more than most men expect. Testosterone replacement is the clearest example: supplemental testosterone suppresses the pituitary signals that drive sperm production and can reduce a count to zero. Anabolic steroids do the same thing. If you are taking either and trying to conceive, that is a conversation to have with your prescriber before changing anything.

Finasteride, prescribed for hair loss and enlarged prostate, also reduces semen volume and sperm concentration in some men, and that effect reverses after stopping. Long-term opioid use, which suppresses reproductive hormones, and sulfasalazine, used for inflammatory bowel disease, can also lower sperm counts.

Lifestyle and Environmental Causes

Smoking has the strongest evidence against it. ASRM's committee opinion reports an average 22% reduction in sperm concentration among smokers, and the effect is dose-dependent. Heavy alcohol use, obesity, and sustained heat exposure from hot tubs, saunas, or a laptop held against the lap are also associated with lower counts. Evidence on cannabis points in the same direction but is weaker, drawn largely from small studies with inconsistent results.

How to Increase Sperm Count: What the Evidence Supports

One point shapes everything below: sperm take roughly three months to develop. Any change you make today shows up in a semen analysis about 90 days from now, not in a few weeks. Judging a new habit or supplement before then tells you nothing.

Changes With the Strongest Support

Stopping smoking has the most consistent evidence behind it. Losing weight if you are carrying excess, moderating heavy drinking, and reducing regular heat exposure are all reasonable and low-risk. Stopping anabolic steroids matters enormously, though recovery can take a year or longer and should be supervised. If a palpable varicocele is present alongside abnormal semen parameters, surgical repair is an evidence-supported option worth discussing with a urologist.

Supplements: Modest and Uncertain

Antioxidant supplements are widely sold for male fertility, and the evidence is real but thin. A Cochrane review of 61 trials found that antioxidants may improve clinical pregnancy and live birth rates, but rated the certainty of that evidence low. Coenzyme Q10 and carnitine have performed best in head-to-head analyses for concentration and motility.

However, none of these replace finding out why sperm count is low. A supplement will not fix a varicocele, an obstruction, or suppressed hormone signaling.

Medical Treatment for Low Sperm Count

When a low sperm count is traced back to hormonal signaling, medication can help. Which one depends on the specific pattern your bloodwork shows, so all of these follow a workup rather than precede it.

Clomiphene Citrate (Clomid) blocks estrogen feedback at the hypothalamus, raising LH and FSH, which in turn stimulate testosterone production and spermatogenesis. Prescribed off-label for men, since its FDA approval covers female infertility only, and often preferred over testosterone because it does not suppress sperm production.
Vitamin D2, worth correcting where a deficiency is confirmed on testing, though its specific effect on sperm count is not established.
Anastrozole, an aromatase inhibitor used off-label for men with a low testosterone-to-estradiol ratio. Not currently stocked.
Injectable hCG and FSH, used in specific hormonal diagnoses and dispensed through a specialty pharmacy.

Testosterone is the notable omission from that list. It raises testosterone levels while suppressing the pituitary signals that drive sperm production, which is why it is avoided in men who want to conceive.

How to Get Your Sperm Count Tested

A semen analysis is the standard test. You provide a sample after two to seven days without ejaculating, and because counts vary considerably between samples, two tests spaced several weeks apart are usually needed before any conclusion is drawn.

Home test kits are convenient and can be a reasonable first step, but most measure concentration only. They will not tell you about motility, morphology, or volume, and a normal home result does not rule out a problem. If you have been trying to conceive for a year without success, or six months if your partner is over 35, a full evaluation is the better route.

Where to Start

If you have been trying to conceive without success, start with a semen analysis rather than a supplement aisle. It is inexpensive, widely available, and tells you whether there is a problem and roughly what kind. Because male factor issues contribute to a substantial share of infertility cases, evaluating both partners at the same time avoids months of unnecessary delay.