I purchased VitaStir MIC B12 and it definitely helped with energy
Progesterone (rises in second half): can have a drying effect on the skin
TCN2-Cbl is internalized by cells through receptor-mediated endocytosis, which is facilitated by transmembrane CD320 protein
Lipotropic injections include B12 plus additional fat-metabolizing compounds like methionine, inositol, choline, and other B vitamins
A 2020 pharmacokinetic review in Drug Delivery found that needle length and gauge directly influence the depth of the bolus, which affects absorption rate for small synthetic peptides with molecular weights below 5,000 Da (PubMed overview of SQ absorption)
It is also required for synthesis of nucleic acid, notably DNA, the metabolism of fatty acids and amino acids in the mitochondria, and in delivering SAMe, the universal methyl donor (16) (30)