Yes, B12 plays a role in cell production and repair, which contributes to healthier hair growth, stronger nails, and clearer skin
Results: Berberine reduced renal injury in STZ-induced DN rat model, as evidenced by the decrease in fasting blood glucose, ratio of kidney weight to body weight, 24-h urinary protein, serum creatinine, and blood urine nitrogen
no controlled trial has tested them together
For example, athletes with high metabolic demands, vegans who consume no dietary B12, or individuals with chronic malabsorption issues like Crohns disease may find they feel their best with a bi-weekly (every two weeks) injection
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