Vitamin K is essential for blood clotting and bone health, but it is not produced through sun exposure. There are two primary forms: vitamin K1 (found in green leafy vegetables like kale and spinach) and vitamin K2 (found in fermented foods and animal products). The body also produces a small amount of vitamin K2 via gut bacteria. Unlike vitamin D, however, vitamin K is not synthesized in the skin and has no direct relationship with sunlight. Vitamin K’s primary role is activating proteins that help regulate blood coagulation and calcium metabolism. Confusing vitamin K with vitamin D could result in overlooking the importance of regular sun exposure for bone health — especially since both vitamins support bones but through different mechanisms. Getting enough vitamin K depends on dietary intake, not sun exposure, making this distinction key for smart nutrition planning.