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So the capsule-vs-sub q question for most peptides isnt a preference its forced by molecular weight

Abstract Purpose Subchondral bone is becoming a treatment target for knee OA patients, with promising early findings on the use of bone marrow aspirate concentrate (BMAC)

Route reported Oral capsule/powder is by far the most commonly discussed route commercially

These include: oral (swallowed into the stomach) intravenous (injected into the vein) subcutaneous (injected into the fatty tissue just under the layer of skin) Intramuscular injections may sometimes be used instead of intravenous injections because some drugs are irritating to veins or because a suitable vein cannot be located

eNeuro 7 (3), e1e17