PQQ is a vitamin-like nutrient that stimulates the growth of new mitochondria to encourage youthful cellular energy levels
Most people give it as a subcutaneous injection, meaning just under the skin, not into muscle
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Researchers interested in skin-visible anti-aging effects tend to study GHK-Cu
NNMT has been explored as a target in obesity, insulin resistance, and age-related metabolic decline, supporting the rationale for translational research into body composition and performance contexts (Kannt & Pfenninger, Frontiers in Physiology )

In contrast, insulin primarily affects fasting glucose levels with minimal influence on post meal glucose levels and no relation to gastric emptying ( The improved regulation of glycemia by GLP-1RA, along with their ability to reduce lipid synthesis, enhanced beta oxidation of free fatty acids and autophagy of fat cells contributes to their lipid modulation properties ( Oral semaglutide has been found to improve fasting blood glucose levels in a trial conducted over a 12 week period with improved levels of triglycerides, very low-density lipoprotein (VLDL), low- density lipoprotein (LDL) and apolipoprotein B48 (ApoB48) and no change in high density lipoprotein (HDL) ( 4.5 Musculoskeletal effects T2DM raises the risk of fractures, poor bone repair, and other factors that lead to brittle bones (69)