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This connection has led researchers to focus on better understanding the effect of low vitamin B12 on obesity, insulin resistance, type 2 diabetes, and cardiovascular disease

Ideal For: Seasonal wellness, travel prep, or fighting off the crud. Key Ingredients: High-dose Vitamin C, Zinc, and Glutathione

Older people are more likely to have a deficiency because they might not absorb vitamin B12 as well as they used to

Vegans and vegetarians are naturally at higher risk since B12 comes mainly from animal products

Certain populations face elevated risk of developing very high serum B12 levels, though true toxicity remains rare even in these groups