B12 injections are indicated for patients with documented deficiency, including those with pernicious anaemia, malabsorption disorders, following gastric surgery, or with neurological symptoms suggesting B12 deficiency
Nutrients 2017;9:E270
Methionine is a sulfur-containing amino acid that improves skin elasticity and strengthens hair and nails (PubChem, 2020)
They could be completely ineffective or, worse, seriously dangerous to your health
Adv Nutr 2017;8:971-9
Ng, The Effects of Human GH and Its Lipolytic Fragment (AOD 9604) on Lipid Metabolism Following Chronic Treatment in Obese Mice and 3-AR Knock-Out Mice, Endocrinology, Volume 142, Issue 12, 1 December 2001, Pages 51825189