Compounding pharmacies existed before Ozempic and their entire business model is producing custom drugs at reasonable prices. For Ozempic, they order the GLP-1 peptides from a large Pharma company and then mix it to order with bacteriostatic water and any other additives. Mine includes a B-12 compound that is attempting to help with the weight loss. They are highly regulated and require trained and licensed employees. The compounding pharmacies I don't trust are the ones that only started to do Ozempic and nothing else. But I do trust my local one. They've made me medication for my animals for decades now.