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It is a synthetic peptide that works by increasing growth hormone receptor expression in cells and activating specific signaling pathways, but it is not itself a hormone

Your doctor might recommend a B-12 test if you have: Tingling in the hands and feet Problems with balance A racing heart Confusion Dementia Weakness Loss of appetite You may also take this test if your doctor suspects you might have pernicious anemia

Vitamin B12 deficiency causes megaloblastic anaemia and a progressive peripheral neuropathy that can be irreversible if not treated

doi: 10.1210/jc.2003-030532 58 StovingRKVeldhuisJDFlyvbjergAVintenJHangaardJKoldkjaerOGet al