By Dr. Oliver Pack (Medical Doctor – Reg. No. 030308944).
The consumption of sports and nutritional supplements has become very common, especially among young people. The goal is to improve athletic performance while simultaneously increasing muscle mass. In other cases, they are consumed to facilitate muscle recovery or even to increase strength and power.
However, these supplements, which some people consume instead of natural foods such as eggs, legumes, nuts, fish, or dairy, can have negative effects on fertility: can they affect our ability to have children in the future? Is there a risk that they cause infertility in men and women?
As with everything in life, the answer depends on the type of supplements consumed as well as the quantity. In general, proteins, creatine, and most pre-workout supplements do not negatively affect fertility in healthy individuals, provided they are consumed in appropriate doses.
However, experts do warn about the risks posed by anabolic steroids and testosterone derivatives. These supplements can alter sperm production and hormone levels, which can have a direct impact on reproductive capacity. In fact, these anabolic steroids mimic the action of testosterone, and when introduced externally into the body, natural production is reduced or even stopped.
Recovery can vary depending on age and the amount consumed. Often, in young men, fertility recovers after cessation, and sperm production returns to normal naturally within 3 to 12 months.
However, in cases of prolonged use or very high doses, recovery may be slower or even result in permanent damage, so specialist evaluation is necessary.
There is not yet strong scientific evidence on this subject, although, as in men, the use of anabolic steroids can alter menstrual cycles, ovulation, and even egg quality. Therefore, female fertility could also be affected.
Medical protocols exist that include medications to stimulate testosterone and sperm production (such as gonadotropins or clomiphene citrate) for men. For women, treatment is more complex and damage could be irreversible. The intake of antioxidants may improve egg quality. However, these treatments should be supervised by assisted reproduction specialists.
During the conception phase, it is very important to pay attention to what is consumed so as not to endanger the mother or the future baby. Some sports and nutritional supplements are safe, but others may affect fertility or even pose some risk in early undetected pregnancy.

Basic supplements like protein powder, creatine monohydrate, and electrolytes are generally considered safe when not taken in excess. On the other hand, some supplements should preferably be avoided during this stage:
Pre-workouts containing high doses of caffeine or other stimulants like synephrine, yohimbine, or guarana may alter menstrual cycles, sleep quality, and in high doses are associated with lower fertility or obstetric risk, so they should be avoided or reduced during the conception phase.
“Fat burners” and herbal blends are often poorly regulated and may contain substances with unwanted hormonal effects.
It is also important to avoid megadoses of vitamins or minerals without medical control because, for example, excessive vitamin A can harm embryo development.
Anabolic steroids and prohormones can be genuinely dangerous since they disrupt hormonal balance, affect ovulation and egg quality, and may have severe consequences for both mother and fetus in case of pregnancy.
The most advisable approach during this stage is to prioritize a balanced diet and only use supplements that are truly necessary. Ideally, consult a doctor or gynecologist to review the sports supplements consumed to ensure compatibility with pregnancy planning.