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Some patients notice improved energy or mental clarity within a few days, while others experience more gradual benefits
Response varies: early sensory symptoms like tingling often improve within weeks, whilst cognitive symptoms may take several months
Paris A, Lake L, Joseph A, et al
The website of one London clinic, for example, states that its injections including B12 can treat anaemia, help with weight loss, boost energy, strengthen the immune system and prevent illness
This guide covers how each delivery method works, the core clinical differences between them, who benefits most from each option, and what to expect regarding side effects, treatment frequency, and cost
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