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Once Weekly14 000 IU D3 Per Serving Vitamin Supplement Vitamin D & Your Health Vitamin D commonly called the sunshine vitamin is important for overall good health. Initially it was thought that the effects of vitamin D were restricted to skeletal health. We now know that vitamin D is involved in many other biological processes. Immune System Cardiovascular System Nervous System Endocrine System With once-weekly Replesta® NX it is easy to take advantage of the positive health benefits of vitamin D.