However, not enough research has been done to ascertain the efficacy and safety of glutathione whitening
recueil des travaux chimiques des pays-bas 48:12871298

Adverse Reactions/Side Effects The following serious adverse reactions are described below or elsewhere in the prescribing information: Risk of Thyroid C-cell Tumors [see Warnings and Precautions (5.1)] Acute Pancreatitis [see Warnings and Precautions (5.2)] Hypoglycemia with Concomitant Use of Insulin Secretagogues or Insulin [see Warnings and Precautions (5.3)] Hypersensitivity Reactions [see Warnings and Precautions (5.4)] Acute Kidney Injury Due to Volume Depletion [see Warnings and Precautions (5.5)] Severe Gastrointestinal Adverse Reactions [see Warnings and Precautions (5.6)] Diabetic Retinopathy Complications in Patients with a History of Diabetic Retinopathy [see Warnings and Precautions (5.7)] Acute Gallbladder Disease [see Warnings and Precautions (5.8)] Pulmonary Aspiration During General Anesthesia or Deep Sedation [see Warnings and Precautions (5.9)] 6.1 Clinical Trials Experience Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice

According to the FDA, injectable glutathione for skin lightening carries risks of toxic effects on the liver, kidneys, and nervous system, along with the possibility of Steven Johnson Syndrome
It is frequently used in weight optimization strategies
dipeptidyl-peptidase 3 (DPP3), which is a zinc aminopeptidase involved in protein turnover [190, 191]