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However, it's important to note that for pernicious anaemia or deficiency with neurological involvement, intramuscular hydroxocobalamin injections remain the first-line treatment in the UK, as recommended by NICE and the British Society for Haematology

Many protocols explore 200500 mcg daily for 412 weeks, with dosing frequency and duration varying by research context

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The strongest human clinical evidence is for topical use, including the Leyden 2002 photoaging trial and a 2023 NEEL gel topical study reporting an average 28% increase in skin collagen density at 3 months

Y.LinY.et al (1997)