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D3 Vitamin D regulates a variety of cellular functions including building and maintaining healthy bones

J Endocrinol 160 : 247255 Norrelund H et al

Are B12 Shots Safe While Breastfeeding

The nervous system relies on rapid, efficient electrical signaling to control everything from muscle movement to heart rate

Any appetite-related changes are secondary: as sleep improves, energy returns, and body composition shifts, patients naturally feel more motivated to support those changes with better nutrition

8 9 The consequences of mild or subclinical vitamin B 12 deficiency are less clear but it has been shown to be associated with decreased cognitive performance in both the elderly and children