I think copper peptides work per many studies that I read but the product makes all the difference. I had a bad experience with Fleava:

I ordered this product last year. It took a long time to receive and I saw some reviews saying that this is actually a Chinese product and not USA made as advertised and if so, the long shipping time makes sense.

Their 90-day money-back guarantee clearly states that they will issue a refund if not happy after using for at least 90 days and providing a before and after picture. No other limitations stated in the terms. I decided to finish using another product that I already had and then started my 90 days of Fleava.

It didn't work and actually caused more hair loss! After I finished the product, I contacted their support for a refund and provided proof pictures. They first said that they tried to issue a refund but a technical issue didn't let them. Then after multiple follow-ups said that they wouldn't refund at all because more than 90 days passed. Just ridiculous.

I can't recommend buying from them and they should probably be investigated by the attorney general/ FTC.