what do testosterone pills do

Testosterone pills mainly raise testosterone levels in people who have low testosterone, which can help improve libido, energy, muscle mass, and bone strength when used for a medical reason. They are not a casual “boost” supplement and can cause important side effects, so they should only be taken under medical supervision.

What they do

Testosterone is used to treat low testosterone (hypogonadism) and related symptoms like reduced sex drive, erectile dysfunction, fatigue, and loss of muscle mass. In some cases, it’s also used for delayed puberty and gender- affirming hormone therapy.

Possible side effects

Common and important side effects can include:

• Acne.
• Mood swings, irritability, or aggression.
• Fluid retention and higher blood pressure.
• Sleep apnea worsening.
• Lower sperm count and fertility problems.
• Testicle shrinkage.
• Breast enlargement in men.
• Liver problems and, more rarely, blood clots or heart-related risks.

Important caution

The FDA said in 2025 that it updated labeling for testosterone products after reviewing newer safety data, including effects on blood pressure.

If you want, I can also explain the difference between testosterone pills, injections, and gels in simple terms.