It has a favorable topical tolerability signal in cosmetics and preclinical models, but there is no published human trial quantifying its side effects, and no systemic/injectable safety data at all
Generally, the older you are, the more likely it is that you will notice serious signs of cognitive impairment if you have low B12 levels
This prevents introducing microbes or proteases that could degrade the peptide
Compounds with a molecular weight below 1,000 Da are more easily absorbed, yet overall absorption efficiency may be significantly reduced by the viscous, negatively charged mucus layer and nasal ciliary movement (Marasini et al., 2017
Skin elasticity, vascular health, and connective tissue integrity are all challenged during rapid weight loss