b12 injection botched Patient's Surgery Doesn't Work as Planned in a Shocker My body was eating itself – side effects from vitamin b12

Healthier Appearance: As red blood cell production normalizes, your skin tone may improve, and dark under-eye circles may fade

Kraus, D., et al

Proton pump inhibitors (acid blockers) and over-the-counter non-steroidal anti-inflammatory agents can change the environment of the GI tract predisposing to nutrient deficiencies Unfortunately, that isnt an exhaustive list, but it does give you a pretty good idea of why you should be concerned about your vitamin B12 levels

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Obesity (Silver Spring) 20 (4), 738747

Paired with structured nutrition and training, it can help accelerate progress and break through plateaus