Factors affecting results Age: Older individuals often experience more dramatic relative improvements, as baseline GH levels decline with age
A second study in women with cardiometabolic risk concluded that eating a combination of Brazil and cashew nuts on an energy-restricted diet improved body composition and endothelial function
Westers-Attema A, Lohman BGPM, Van Den Heijkant F, Nelemans PJ, Winnepenninckx VJ, Kelleners-Smeets NWJ, et al
The authors concluded that glutathione, with or without vitamin C and NAC, was well tolerated but did not produce measurable therapeutic benefit in this cohort (Williams et al., 2025)

Subcutaneous injection (most peptides) Best sites: Abdomen (2+ inches from navel) Thighs (outer) Love handles Back of arms (harder to reach) Technique: Clean injection site with alcohol Pinch skin to create fold Insert needle at 45-90 degree angle Inject slowly (2-3 seconds) Remove needle, apply pressure Intramuscular injection (some peptides) Best sites: Glutes (upper outer quadrant) Thighs (vastus lateralis) Deltoids (shoulders) Technique: Clean injection site Insert needle at 90 degrees (deeper than SubQ) Aspirate (pull back plunger slightly to check for blood) Inject slowly Remove and apply pressure Rotation and site management Rotate injection sites: Never use same spot twice in one week Have 8-10 sites in rotation Track sites if injecting multiple times daily Avoid: Injecting into scar tissue Sites with visible inflammation Areas with lumps from previous injections Learn complete technique in our peptide injections guide