According to the NIH Office of Dietary Supplements, functional B12 deficiency is most commonly seen in patients with one or more of the following: Age over 50 stomach acid production declines with age, and stomach acid is required to free B12 from food PPI or H2 blocker use reflux medications suppress the acid needed for B12 absorption Metformin use, which interferes with B12 absorption directly Vegan or vegetarian diets B12 is found almost exclusively in animal products Gut conditions including celiac, IBS, SIBO, and Crohns MTHFR mutations that affect how B12 is metabolized once absorbed Heavy alcohol use The symptoms of low B12 are easy to dismiss: fatigue, brain fog, low mood, tingling in the hands or feet, weakness, and shortness of breath on mild exertion
This type of water is created using 0.9% benzyl alcohol to prevent bacterial growth, allowing the peptides to remain stable in solution
But many of the wellness peptides now sold online or through cash-only clinics are unapproved experimental substances with little to no human evidence
If sublingual B12 doesn't improve your symptoms after a few months, switch to B12 injections since cellular absorption is superior
This makes it appealing in both medical and cosmetic contexts
