Sunlight gives us vitamin D and nitric oxide (which improves blood flow and reduces hypertension). Vitamin D is crucial for the functioning of our immune systems, and the 1000IU dosage of many supplements is laughably small. A light skinned person in a singlet standing outside at noon for 30 minutes will produce between 10,000IU and 20,000IU in their skin. I would recommend supplementing 5,000IU vitamin D while also getting some exposure in the morning or afternoon (but avoiding the sun when it is high in the sky).
https://youtu.be/Kvh4D_osFXs
Sunlight gives us vitamin D and nitric oxide (which improves blood flow and reduces hypertension). Vitamin D is crucial for the functioning of our immune systems, and the 1000IU dosage of many supplements is laughably small. A light skinned person in a singlet standing outside at noon for 30 minutes will produce between 10,000IU and 20,000IU in their skin. I would recommend supplementing 5,000IU vitamin D while also getting some exposure in the morning or afternoon (but avoiding the sun when it is high in the sky).