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Description
[5] Similarly, individuals who have undergone gastrointestinal surgery particularly gastric bypass, gastrectomy, or ileal resectionoften have impaired B12 absorption and require supplementation

The reasons: Low lower limit : In most countries, the lower end of the standard vitamin B12 range (100-250 pg/mL) is too low, often missing severe deficiencies

Doctors should look at genetic tests and each patients situation to find the right dose

People who had weight loss surgery may need shots
Do not take a double dose

Active-form methylcobalamin circumvents that bottleneck and supports more predictable cellular uptake
