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In a recent review (2018) by the famous Cochrane Institute, it was reported that studies which had been published on this topic only provided very low-quality evidence that oral B12 is as efficacious as intramuscular B12

Bradley, C

3.1% with placebo)

Propagation of postsynaptic currents and potentials via gap junctions in GABAergic networks of the rat hippocampus

These include members of the transforming growth factor (TGF-) superfamily, insulin like growth factor 1 (IGF-1), epidermal growth factor (EGF), connective tissue growth factor (CTGF), bone morphogenetic protein-2 (BMP-2), osteogenic protein-1 (OP-1), and growth and differentiation factor-5 and 6 (GDF-5/6) (Kos et al., 2019)