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Your choice depends on your specific goals, risk tolerance, and preference for newer versus established compounds
See what experts recommend, and why , in the What It Does section of our Psyllium Supplements Review
Combination is key: The MMA test is best performed together with the serum B12 test (and possibly the holo-TC test) to get a comprehensive picture of your B12 status
The European Journal of Pharmacology, 473(23), 193204
If symptoms, lab concerns, or a known medical condition are driving the question, a clinician should help determine whether testing, primary care follow-up, or another next step is needed