Avoiding the Buy / Sell / Trade section of TG groups helps a lot. Scamming risk is higher with steroids than peptides, but there are other issues like lack of COAs.
Not buying from anyone who DMs you first, even if they seem to be the exact same person who is running a Chinese vendor's TG group. They fool people all the time since they will do it within minutes of that person joining the same group, making the person think it is legitimate.
Especially with the Chinese vendors, you will get ppl pretending to be the owner or staff, DMing you with a pricelist, or wanting to know what you are interested in, etc.