(CNN, KYMA/KECY) – The crackdown on off-brand weight loss drugs and diabetes treatments are about to take effect, meaning supplies or treatments are likely to tighten up as well. A federal deadline to halt the sales of GLP-1 medications arrives this week. The off-brand products are made by compounding pharmacies that contain the same active ingredients as Ozempic, Wegovy, and others. The difference is that they don't have the stamp of approval f…