Other symptoms of B12 deficiency include numbness in your hands and feet, sore mouth or tongue ulcers, vision problems, and loss of appetite or weight loss
(2) J M Monti, J Debellis, P Alterwain, T Pellejero, et al (1987) Study of delta sleep-inducing peptide efficacy in improving sleep on short-term administration to chronic insomniacs International Journal of Clinical Pharmacological Research, 1987, Volume 7 (Issue 2), Pages 105-10
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Hydroxocobalamin is the form the NHS uses because it lingers in the body longer than cyanocobalamin, and its pharmacology supports dosing intervals of up to three months once levels are stable
Traditionally used as a blood-building and cleansing tonic