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Nucleobindins and encoded peptides: from cell signaling to physiology
Route of Administration It comes as no secret that both subcutaneous and shallow intramuscular injections are the most effective method of delivering a consistent dose of testosterone to the bloodstream

I definitely have some problem metabolising B12 (or did before injections) because they 'cured' my TN (it's never truly cured, being incurable!), but I also discovered recently that Restless Leg Syndrome was a real thing (I believed it was just like getting a headache, I didn't know it was an actual condition) and that iron could help some people with it
As to biasing, while the literature focuses on receptors, commonly G protein-coupled receptors [GPCRs, recently reviewed in (Ma et al