The most-cited musculoskeletal study is Staresinic et al
There may be side effects of glutathione that are not listed here
They can guide you through the process and recommend alternative treatments or supplements, such as Vitamin C, Alpha Lipoic Acid, or N-Acetylcysteine
Additional Monitoring May Be Considered In: Higher-frequency regenerative research protocols Long-duration experimental protocols Multiple concurrent regenerative or metabolic-support compounds Significant peptide-sensitivity research models Liver-function or copper-metabolism-related investigations due to the inclusion of GHK-Cu Avoid or Carefully Evaluate In Research Models With: Known hypersensitivity to peptide compounds Active severe systemic illness Severe uncontrolled cardiovascular, metabolic, or neurological conditions Active or suspected malignancy-related, tumor-related, or abnormal proliferative conditions Pregnancy or breastfeeding contexts Additional Research Considerations Because Glow Blend contains GHK-Cu, prolonged or higher-frequency research exposure may influence copper and zinc balance in some research settings

In some cases, they couldn't find any published clinical studies in humans and there were safety concerns like the potential to encourage cancer growth or to trigger a massive immune response