doi: 10.1126/sciadv.1400121 226 NaculLde BarrosBKingdonCCCliffJMClarkTGMudieKet al
Cloudiness can indicate bacterial contamination, improper mixing, or that the peptide has fallen out of solution
(PubMed) Arner ES
DSIP (delta sleep-inducing peptide) is a nine-amino-acid neuropeptide first isolated from rabbit thalamic perfusate in 1977
Several factors can impair B12 absorption: Reduced stomach acid production (achlorhydria or hypochlorhydria), common in older adults and those taking proton pump inhibitors or H2-receptor antagonists long-term, impairs the release of B12 from food proteins Pernicious anaemia , an autoimmune condition destroying parietal cells and reducing intrinsic factor production, completely blocks the primary absorption pathway Gastrointestinal disorders including Crohn's disease, coeliac disease, or surgical removal of stomach or ileum sections directly damage absorption sites Metformin , commonly prescribed for type 2 diabetes, may reduce B12 absorption through unclear mechanisms
It is also interesting to note that many of the amino acids that stimulate meningococcal growth, namely, L-glutamate, glycine, L-serine, and L-cysteine (Wesley Catlin, 1973), are involved in glutathione metabolism and the -glutamyl cycle
