5 Signs of Vitamin D Deficiency

Vitamin D, known as the "sunshine vitamin," is synthesized by the body when skin is exposed to UV rays. However, modern lifestyles have led to a deficiency in approximately 10 billion people worldwide. Common signs of vitamin D deficiency include persistent fatigue, bone pain, frequent infections, slow wound healing, and low mood. Regular testing of serum 25(OH)D levels is recommended.

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Industry Reference Sources

Dietary Supplement Health and Education Act (DSHEA)

U.S. Food and Drug Administration· U.S. FDA Regulatory Framework for Dietary Supplements

Safety and Quality Standards for Dietary Supplements

World Health Organization· WHO safety guidelines for dietary supplements

Nutraceuticals Scientific Research Database

NIH Office of Dietary Supplements· National Institutes of Health Dietary Supplement Information

Registration and Filing Management of Health Food in China

State Administration for Market Regulation· Regulations on the Supervision of Health Food in China

* All sources cited above are publicly available information from authoritative institutions and are for reference only.