Paganelli F, Mottola G, Fromonot J, et al
One major study found that 39% of the general population had borderline or deficient B12 levels, with no significant difference between meat-eaters and vegetarians suggesting that how well your body absorbs B12 matters as much as how much you consume
Plasma levels drop 60% between your 20s and 60s, and that deficit correlates directly with slower skin remodeling and thinning hair
When combined with fasting hours that can extend from approximately 4 am to 9 pm during UK spring and summer months, this reduced thirst response potentially leads to dehydration, headaches, dizziness, and fatigue
J Med Chem 58:73707380 Gotfredsen CF, Molck AM, Thorup I et al (2014) The human GLP-1 analogs liraglutide and semaglutide: absence of histopathological effects on the pancreas in nonhuman primates