Your provider screens for all of this before recommending anything
the folate content of fortified cereal varies greatly
However, it does not have a scent
Glycine and N-acetylcysteine (GlyNAC) supplementation in older adults improves glutathione deficiency, oxidative stress, mitochondrial dysfunction, inflammation, insulin resistance, endothelial dysfunction, genotoxicity, muscle strength, and cognition: results of a pilot clinical trial
Your GP can advise on which tests, if any, are indicated in your case
Proteins Both peptides and proteins are made up of strings of amino acids that are held together by peptide bonds