Been ordering peptides for about two years now and I want to share something I wish someone had told me earlier. I spent my first year almost exclusively ordering from overseas because the prices were significantly cheaper. On paper it made sense. In practice... not so much.
The biggest thing that caught me off guard was the hidden cost of actually verifying what you got. When you order domestic from a source that posts third-party COAs, you can at least see what was tested and by who. Ordering overseas, you are basically trusting a label. The only way to know for sure is to send it out for independent testing yourself, which adds cost and weeks of waiting. I did this twice and one of the results came back with purity way lower than advertised. So the "savings" evaporated pretty quick.
Then there is shipping. Domestic you are looking at a few days, maybe a week tops. Overseas I have had orders show up in two weeks and I have had orders take almost six weeks. And for most of that time the tracking just says the package is in transit somewhere with no updates. If you are on any kind of timeline for your research that is a real problem. You just sit there wondering.
And the seizure thing is real. I had one package get held at customs and it never showed up. Just gone. No refund, no replacement, nothing. Some people budget for that and order extra to account for losses which honestly says a lot about the risk level.
I am not saying never order overseas, some people have had consistently good experiences with it. But I think a lot of people go in only looking at the price per vial and do not factor in testing costs, the shipping uncertainty, or the chance that you just lose the whole order. Once I started adding all that up the math looked pretty different.