The reason is that serum B12 measures circulating vitamin B12, not tissue stores

RABSIP D CAPSULE - RABEPRAZOLE 20MG+ DOMPERIDONE 30MG RABSIP DSR CAPSULE - RABEPRAZOLE 20MG+ DOMPERIDONE 30MG RABSIP DSR CAPSULE (STRIP) - RABEPRAZOLE 20MG+ DOMPERIDONE 30MG RABSIP DSR CASULE STRIP - RABEPRAZOLE 20MG+ DOMPERIDONE 30MG RABSIP IT CAPSULE - Rabeprazole (20mg) + ITOPRIDE (150mg) RABSIP IT CAPSULE - Rabeprazole (20mg) + ITOPRIDE (150mg) RABSIP L CAPSULE 10X10 RABSIP L CAPSULE 20X10 - Rabeprazole (20mg) + Levosulpiride (75mg) RC TROL 0.25 CAPSULE - CALCITRIOL 0.25MCG CAPSULE RC TROL PLUS CAPSULE - Calcitriol(0.25mcg),calcium Citrate(425mg),zinc Sulphate(20mg) & Magnesium Oxide(40mg) ROVITA MAX SOFTGEL CAPSULES - Lycopene 10% 5000mcg+ L Arginine 100mg+ Selenium (as Sodium Salenate) 75mcg+ Ginseng 42.5mg+ Grape Seed Extract 10mg+ Green Tea Extract ROVITA OD CAPSULE - Cyanocobalamin(2.2mcg),alpha Lipoic Acid(100mg), Vitaminb1(2.3mg), Chromium(200mcg), Inositol(150mg) Softgel Capsule ROVITA-24 CAPSULE - Pinus Gerardiana Bark Extract 50 Mg Ginseng Extract 21.25 Mg Green Tea Extract 10 Mg Vitamins Vitamin C 40 Mg Vitamin B3 12 Mg Vitamin E Acetate 10 Mg ROYAL D PLUS CAPSULE - Shilajit Shudh 25mg + Calcium (as Dcp) 37mg + Phosphate (as Dcp) 29mg + Ashwahandha Extract Powder 50mg + Ginseng Extract Powder 45mg + Ferrous Fumarate 30mg SALTEROL 250 DPI CAPS - SALMETEROL(50MCG) & FLUTICASONE PROPIONATE(250MCG) ROZUSAF A 20MG CAPSULE - Rosuvastatin 20 mg & Aspirin (as EC Pellets) 75 mg ROZUSAF C 20 CAPSULE - ROSUVASTATIN(20MG) & CLOPIDOGREL(75MG) CAPSULE ROZUSAF GOLD 10 CAPSULE - Rosuvastatin Calcium Eq

Cell Physiol Biochem 47(5):18711882 Jia WQ, Zhu JW, Yang CY, Ma J, Pu TY, Han GQ, Zou MM, Xu RX (2020) Verbascoside inhibits progression of glioblastoma cells by promoting Let-7g-5p and down-regulating HMGA2 via Wnt/beta-catenin signaling blockade
There's no one-size-fits-all answer, and any credible 5-Amino-1MQ dosage guide must acknowledge this inherent variability
What we know The biology may be interesting, but the consumer claim needs direct human evidence