A panel of advisers to the Food and Drug Administration will meet this week to make recommendations on whether specialized pharmacies should be allowed to make some popular wellness peptides.

The committee will discuss whether compounding pharmacies can make the peptides in question. But FDA scientists say there’s little — if any — evidence they work in humans.

As regulators weigh whether pharmacies can legally compound wellness peptides, companies are preparing for a repeat of the GLP-1 boom—only this time with even murkier science.