The correct approach: Test serum B12, MMA, and homocysteine not just serum B12 Use the functional cutoff of 500 pg/mL for optimal status, not the labs lower limit of 200 pg/mL Identify the cause diet, malabsorption, medication, or autoimmune Match the supplementation protocol to the cause and severity Retest to confirm response, and continue monitoring if the underlying cause persists If youre over 50, vegan, taking metformin or PPIs, or experiencing unexplained fatigue, brain fog, or neuropathy get tested
Foods high in B12 include fish, meat, poultry, eggs, dairy produce, and foods that are fortified with B12 (like some breakfast cereals.) If you follow a restrictive diet or have a condition that impacts absorption, you could be at risk for a B12 deficiency
SLU-PP-332 is supplied as a research-grade small-molecule compound
Related products BEST SELLERBEST SELLER
Watch the full podcast episode here: YouTube Video on Peptides Update July 13, 2026 Since this article was originally published, Weight Loss & Vitality has begun offering this peptide in select clinical circumstances when it can be legally prescribed and dispensed through an appropriately licensed pharmacy