Epitalon: What can this peptide do for telomere protection, aging, and longevity, and where is the evidence? Healthspan Same peptide, different needle, different drug. The route of injection isn't a logistical detail. It's pharmacology. When a drug enters your body matters as much as how much enters. Subcutaneous tissue is Peptides absorb 100%. Capsules and serums under 2%. I was spending hundreds a month on supplements and skincare. Then I ran the bioavailability math and realized my body was using almost none Peptides absorb 100%. Capsules and serums under 2%. I was spending hundreds a month on supplements and skincare. Then I ran the bioavailability math and realized my body was using almost none