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The most comfortable way of doing this is by measuring the methylmalonic acid (MMA) in the urine, which determines how much vitamin B12 the cells actually receive

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For deliberate weight loss, options with stronger human clinical trial evidence include certain prescription medications (many of which are injectable) and select oral supplements supported by trials

Clinical Markers for Treatment Effectiveness We watch for signs of success by checking clinical markers

Absorption is boosted when the B12 mixes with saliva, since you secrete a B12 binding protein from your salivary glands that helps transport B12 safely through the digestive tract

This typically resolves within 1-2 weeks and doesn't affect actual fat loss