Do peptides interact with supplements like fish oil or vitamin D?

No major interactions with common supplements. Fish oil's blood-thinning effects combined with healing peptides are unlikely to cause problems, but inform your doctor if taking high doses (>3g/day). Vitamin D is safe with peptides. <a href='https://ods.od.nih.gov/factsheets/list-all/' target='_blank'>NIH Supplement Fact Sheets</a>