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Some analyses show 12-58% of products contain contamination, 30% have incorrect amino acid sequences, 65% exceed endotoxin safety thresholds, and 20% are mislabeled entirely
As noted, the present knowledge is limited, and these are considerations, not strong recommendations
Additionally for people who are dealing with an acute B12 deficiency, oral supplements may not be the best course of action given that there is no way to determine how much is actually absorbed
Rapid weight loss risks: Losing weight too quickly (more than 2 pounds per week) can cause gallstones, muscle loss, or nutritional deficiencies
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