10.1016/0169-328X(95)00075-4 Mol
Blood tests are conducted periodically to ensure that vitamin B12 levels are within the desired range and to monitor the resolution of anaemia
Improvements in skin texture may show up within a few weeks, but more significant effects on fine lines or hair growth often take two to three months or more of steady use
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Extended continuous use beyond 12 weeks may lead to diminishing returns as receptors downregulate
