27/01/2026
Did you know the official vitamin D recommendation might be based on a statistical mistake? 🤯
Public health guidelines say 600 IU/day will get 97.5% of people to healthy vitamin D levels — but that number was calculated using study averages, not individual responses. When the data are analysed correctly, 600 IU/day only gets most people to ~27 nmol/L, far below the healthy target of ~50 nmol/L. To reach that target in 97.5% of people, the corrected maths suggests closer to 8,000–9,000 IU/day might be needed — which is many times higher than current guidance. 
This doesn’t mean everyone should take a mega-dose — vitamin D needs vary a lot between individuals, and blood testing should guide appropriate dosing. Always talk to your clinician before making changes. 🩺
📖 Read the original study here: https://pmc.ncbi.nlm.nih.gov/articles/PMC4210929/
