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1,2 It is coabsorbed with intrinsic factor, a product of the stomach's parietal cells, in the terminal ileum after being extracted by gastric acid 1,2 (Figure 1 3 )

However, if youre already getting enough vitamin B12 in your diet and dont have a nutrient deficiency, its unclear whether increasing your intake of vitamin B12 will have much of an effect on weight loss.

Approximately 22% to 30% of these low levels may be falsely low

In vitro studies confirm minimal cytotoxicity with no impact on cell viability up to 100 M concentrations across multiple cell types, though higher concentrations may produce non-specific effects that could confound experimental results

Focusing on protein is a huge part of my nutrition and even calorie and macro counting, but it's also to help maintain muscle mass