The parent compound exists naturally in human gastric juice as part of a much larger protein weighing approximately 40,000 daltons
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The product sold by clinics is a synthetic 15-amino-acid peptide manufactured by "solid-phase synthesis", administered under the skin, into the muscle or a joint, or intravenously, often at higher doses for weeks
If a deficiency does not exist, supplementing Vitamin B12 will likely not have the same positive effect. B12 injections are available, for $15 to $50 a pop, at spas and wellness centers, but its smart to talk to your physician before you spend money on them