A large US study found that people taking these medications were more likely to experience two types of hair loss:

• Telogen Effluvium (TE): sudden shedding of hair, often triggered by stress or rapid weight loss.

• Androgenic Alopecia (AGA): gradual thinning or pattern baldness, often genetic.

The study compared nearly 550,000 GLP-1 users to a similar number of non-users and found:

• At 6 months, GLP-1 users had a higher risk of hair loss, especially male/female pattern baldness.

• At 12 months, risks increased further, with much higher rates of both shedding and pattern hair loss.

• Alopecia areata (patchy autoimmune hair loss) was not linked to GLP-1 use.

Why this happens:

• The drugs themselves may not directly cause hair loss.

• Instead, rapid weight loss and big body changes can trigger temporary shedding, which may also make underlying baldness show up earlier.

What this means for patients:

• Hair loss is usually temporary and reversible, often improving once weight stabilises.

• Doctors recommend:

  • Pacing weight loss rather than losing too quickly.

  • Ensuring good nutrition (enough protein, iron, zinc, vitamin D, B12).

  • Checking for other causes (like thyroid issues).

  • In some cases, standard treatments like minoxidil may help.

Key takeaway:
If you’re starting a GLP-1 drug, be aware that temporary hair shedding is fairly common and usually improves within 3–6 months. Supporting your nutrition and avoiding extreme, fast weight loss can help reduce the risk.