Question: Is it important to get vitamin D sulfate specifically from the sun? Short Answer: It is important to get morning outdoor sunlight as close to every day as possible for your circadian rhythm, and to get some exposure to unprotected sunlight during the day when UV is available, but at doses less than needed to cause reddening, and it is equally important to always avoid burning. There are many reasons for this, and the cholesterol sulfate hypothesis — to which the vitamin D sulfate hypothesis is peripheral — is an interesting and worthy hypothesis but should not be the final arbiter of your sun exposure habits. This is a clip from a live Q&A session open to CMJ Masterpass members. In addition to this episode, you can access two other free samples using this link: https://chrismasterjohnphd.substack.com/p/questions-on-vitamin-d-sulfate-synthesis In that batch of free episodes you will also find the answers to these questions: What cofactors are needed to synthesize and recycle BH4? How Much Iron Can We Absorb At Once? If you want to become a Masterpass member so you can participate in the next live Q&A, or so you can have access to the complete recording and transcript of each Q&A session, you can save 10% off the subscription price for as long as you remain a member by using this link to sign up: https://chrismasterjohnphd.substack.com/qanda Learn more about the Masterpass here: https://chrismasterjohnphd.substack.com/about This snippet is from the February 15, 2023 AMA. The full recording and transcript is reserved for Masterpass members. Here is a preview of what’s included: What cofactors are needed to synthesize and recycle BH4? How Much Iron Can We Absorb At Once? What nutrients are important for long-term PPI use? For how long does transferrin saturation respond to recent iron-rich food? Muscle spasms: creatine, creatinine, sodium, and potassium. Hematologists ignore iron saturation. How to detox arsenic? Could folic acid supplements impair BH4 recycling? How to increase butyrate? More on hematologists and transferrin saturation. Here’s a link to the full AMA: https://chrismasterjohnphd.substack.com/p/recording-and-transcript-of-the-february