Loss of skeletal muscle estrogen-related receptors leads to severe exercise intolerance The Estrogen Receptor-Related Orphan Receptors Regulate Autophagy through TFEB Losby, McKenna et al
In contrast, the passive diffusion process of B 12 absorption normally a very small portion of total absorption of the vitamin from food consumption may exceed the haptocorrin- and IF-mediated absorption when oral doses of B 12 are very large, with roughly 1% efficiency
Safety considerations for unapproved peptide products
The 28-day window assumes proper aseptic technique on every puncture: alcohol-swab the stopper, use a fresh sterile needle for each draw, do not introduce contamination through the needle or syringe
Genetic Factors: Some individuals have MTHFR gene mutations, making it incredibly difficult to process synthetic B12
It is to note that in the above studies explored the regression of the clinical manifestations (especially neurological signs) there was no relevant difference in the efficacy of oral or IM vitamin B12 administration [21,22,24]