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The duration of a B12 injections effects varies, but most people experience benefits for a few weeks to a few months

It is effective for acute neuropathy, multiple neuropathy, sciatica, and rheumatoid neuropathy

HPG Axis Signalling and Spermatogenesis Research Luteinizing hormone-driven testosterone is central to spermatogenesis, with LH acting on Leydig cells to stimulate steroid production and intratesticular testosterone binding to androgen receptors on Sertoli cells influencing gene transcription and paracrine signalling required for germ cell development

Medications such as metformin (used for diabetes), which interferes with vitamin B12 absorption