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First 1,000 days are immune system golden time; why vitamin D supplementation is essential for infants
The first 1,000 days after birth are a critical period for building the foundation of lifelong immunity, with vitamin D acting as a key regulator of immune cell function, not just bone health. Modern lifestyles mean many pregnant women and infants lack vitamin D, increasing the need for supplementation. Kim Seok-jin of Good Bacteria Research Institute introduced guidance on managing vitamin D and safe dosing, while warning against excessive long-term intake and advising blood tests and medical consultation.
