One thing I'd add to the follow-up point: check if their account history shows consistent activity across other threads, not just vendor praise. I've been around this forum the whole time I've been losing my weight, and the accounts with a real mix of posts are the only ones whose source recommendations I take seriously.
How do you vet a new source safely?
Honestly the account history point is what got me too - I'm 53 lbs down on Wegovy and I've learned to click profiles before believing anything. If someone's only ever posted in vendor threads, I scroll right past, no matter how glowing the review is.
Only 9 lbs into my Mounjaro run so I'm still mostly lurking, but the pattern I've noticed matches yours - the reviews I trust come from people whose posting history includes gripes and slow weeks, not just praise. If an account reads like an ad, I move on.
Early days for me too, only a few pounds gone, but I already click profiles out of habit. What sells me is when someone mentions a hiccup or a slow stretch alongside the praise, since real use never runs perfectly smooth.
I look for whether they stick around after the sale - accounts that keep logging normal side effects and stall weeks months later are worth way more than a one-time rave. Down barely anything myself yet so take it for what it's worth, but the vibe check seems consistent across the whole thread here.