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[125] Storage and excretion [edit] How fast B 12 levels change depends on the balance between how much B 12 is obtained from the diet, how much is secreted and how much is absorbed

A1298C Mutation This mutation affects a different part of the enzyme, more involved in neurotransmitter production (especially BH4 synthesis) than directly in methylfolate production

Requirements Male or Female Healthy 18 - 25 years old BMI 18 - 40 kg/m 2 Not taking any medications Non-smoker, Occasional smoker or Heavy smoker Study visits Appointment only, 1 clinic visit 1 clinic visit 3 steps to get started Step 1 Register your interest Explore our current trials and complete a short eligibility form

The wrinkle (no pun intended) is that levels crash as we get older