@volume-1 If there is a third-party COA I wouldn't find it necessary to send a vial for testing. If there are rumors of sketchy things going on I would probably skip that vendor. Why? Testing is expensive ($200-300+) not counting your sacrifice of one vial.
IMHO doing your own testing only makes sense when you are sharing the cost with other people or you are buying enough kits on your own to justify the cost.
For anyone who is a newbie here are some other things to watch for:
• Some vendors will swear to god they do third-party testing but if you search their website you won't find ANY COAs anywhere. Or they post two or three and hope you won't notice the other 17 or 18 that are missing when they're selling 20 SKUs.
• Be sure the lab IS a third-party lab and not their own in-house lab. Look for a business name at the top or bottom. No business name on the COA? Hahahaha... excuse me while I go make some COAs for my friends 
Some vendors will be up-front and tell you they do their own in-house testing. Unless they ALSO do third-party testing I wouldn't trust their in-house COAs.
• Be sure to check the date on the COA. It can be anywhere on the form. I would definitely pass on anything over a year old. I would probably pass on anything older than 8 months because there is a good chance there is a vendor out there with a fresher product. A peptide can degrade over time even while frozen for several years.
