What do we know about 'research only' peptides? Q&A with expert Stuart Phillips McMaster News BPC 157 500 mcg Oral Capsules Kristina dealt with a chronic hamstring injury for over two years. Physical therapy helped, but she still felt stuck, making progress, then hitting the same wall. After consulting with @dr_greene_do and adding Have you used peptides? What are your thoughts? Let me know below Peptides are short chains of amino acids that play vital roles in cellular signaling and repair throughout the body.