There is very little human clinical trial data to support their effectiveness or safety
Silva M, Grillot D, Benito A, Richard C, Nuez G
For liver IGF-1 measurement, liver tissues were weighed and homogenized in lysis buffer containing PBS, 1% Triton X100 and a protease inhibitor mixture (Roche, cOmplete, EDTA-free Protease Inhibitor Cocktail)
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Peptides are typically administered via subcutaneous injection, but some are available as oral capsules, troches, or nasal sprays