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In general, stacking full doses of both is considered redundant because they stimulate GH through overlapping mechanisms

Vitamin B12 Injections Intramuscular injections are the standard treatment Initial loading phase followed by maintenance doses Often required for life Oral Vitamin B12 High-dose oral supplementation may be effective in some patients Suitable for those who cannot tolerate injections Monitoring Regular blood tests Neurological assessment Monitoring response to therapy Most patients experience rapid improvement in symptoms after starting treatment

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If your results show a mild deficiency and your GP confirms you dont have absorption issues, you can then try a high-dose sublingual spray for 3 months and re-test