Are people using Peptides much? Do we know of reliable sources?

Supplements
#1

I was thinking of trying out SS-31 (Elamipretide) for mitochondria support and Semax for cognitive support. The two sources I was thinking of are https://buy.nobledragons.com/ and https://www.peptidesciences.com/. Has anyone used these?
Would appreciate any insights into sourcing.
thanks

#2

See this thread Finnrick Peptide Quality and Test Ratings Explained

#3

Thanks, this is very helpful.
Somehow it doesn’t show up when I search for peptides.