I've had a similar worry about finding quality Semaglutide. After a lot of digging, I stumbled upon
https://fitnflexed.com—they were a solid find for me. I’ve used them for various supplements and never had an issue with quality. A friend of mine had a rough time with other sites, and this one came through for him too. It's a good idea to check reviews and maybe contact customer service to make sure you're getting what you need.