India, Jan. 9 -- Persistent hair fall, constant fatigue, and nagging gut issues are often treated as separate problems - but in many cases, they can stem from a single, overlooked deficiency. Low vitamin D levels are increasingly being linked to a wide range of health concerns, largely because vitamin D functions more like a hormone than a simple nutrient, influencing inflammation, energy regulation, gut integrity, and even hair health. When identified through proper testing and corrected under medical guidance, vitamin D3 supplementation may offer benefits that extend well beyond bone health.

Deepsikha Jain, a nutritionist with a Master's degree in Global Public Health Nutrition from the UK and a certified national diabetes educator, ha...