Some nutrient ranges, hormonal considerations, and safety checks differ by biological sex.Required
Age changes baseline needs for bone, muscle, metabolic, and recovery support.Required
Body size helps estimate practical dose ranges and avoid generic recommendations.Required
Skin tone affects how much vitamin D your body may produce from sunlight.Required
Country helps infer climate, latitude, marketplace, and product availability.Required
Sun exposure influences how strongly vitamin D support should be considered.Required
