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Weeks 1 to 2: Signs of improvement show up as faster recovery between workouts and lower post-training soreness

B12 Testing Options At A Glance While the NHS is a fantastic resource, the long waiting times can feel like an eternity when youre not feeling well

Pregnant or Breastfeeding Women: Expectant mothers may need additional B12 to support their own health and the development of their baby

For more on B12 form and absorption, see our guide to liquid vitamin B12, and on whether B12 affects the scale, our B12 and weight loss explainer

Effects of the MTHFR Mutation: Reduced Folate Metabolism: Folate (vitamin B9) is essential for many processes in the body, and MTHFR mutations can hinder the conversion of folate to its active form (5-MTHF)