posted 1 month ago
S.A.D. is from lack of any UVB rays able to reach so far through the atmosphere in temperate or arctic winters when the sun is over the other hemisphere, Other healthy parts of the spectrum have no problem. This lack of natural UVB drops our D blood level, destroying our microbiome and critical deep reparative sleep cycles. Just 20 minutes, skin mostly exposed in high summer, noonish, gives palest folks around 20,000IU (2hours for darkest) but depending on latitute, no UVB at all reaches us for varying lengths of winter, even in California/Northern Florida. Food sources are never enough unless eating ancestrally high summer-pastured/D-laden fatty meats or sea blubber *back before we poisoned the seas with mercury! (D is a preHORMONE we make in the cholesterol layer in our skin, though we can also get it from food and supplements but can overshoot if not producing it ourselves from UVB! Our skin/metabolism is very smart, but not so much our gut for oral D since we evolved into brainy humans under copius year round Tropical African UVB!
Blood level, not dosage is the critical number. It is critical to get your D level measured regularly Winter & Summer and take a high enough dose to maintain over 50ng/ml, though above 60 will improve deep reparative NREM sleep cycles by hitting our sleep paralysis switch in our brains that depends on D to function. Yes, we must be paralyzed while our brain is being cleaned by our GLYMPHATIC system. If you've never been low in D (tropical zones and outside carefully non-burning unprotected UVB doses year round or supplementing), this will function with a level around 50ng/ml, too. Winter's solar spectrum, lacking any tiny UVB, is still quite healthy, but unlike for UVB, stripping is not needed to absorb the healthy infrared parts of the spectrum that predominate at dawn & dusk. *Fauci, when younger, was taking 6,000IU in Summer, 8,000IU in Winter, but as our bodies age (or especially fatten!) we need more. Obese people who are not sufficiently supplementing are almost always deficient! When obese, we cannot ever get enough from the sun.
D needs a critical team for effectiveness and safety. Magnesium is critical for building more D-receptors in all our organs & systems, but it is not vitamin K1 from green veggies (which thins the blood and is contraindicated for many common medications), but K2 (bacterial fermented foods) which pairs with D. One of D's powers is to dramaticallly improve our microbiome and general gut health, allowing us to absorb far more calcium from the exact same food. But without K2 that calcium can become dangerous and even cause hypercalcemia with solid deposits in every unhealthy and/or painful place. K2 (I've read 400mcg of MK7 form is great daily dose to protect against atherosclerosis.) K2's main job is to direct all that extra calcium safely into bones and teeth where we want it!
Early in Covid, when I finally got my severe D deficiency of only 6ng/ml (where people were at highest risk of dying of Covid) up above 50ng/ml, my long severe depression lifted and my arthritis and backpain disappeared completely. In new hope and painlessness, I started a Keto lifestyle and finally began to lose a whole lot of weight fairly quickly. But quick fatloss is a D danger timezone! If the blood level has been raised like mine was, that fatburning will dump all the burned fat's D into the blood and I did shoot over 100ng/ml! (Hypercalcemia is exceedingly rare, but very common D deficiency is causing far more health issues.) Easy to solve as long as testing is regular enough to catch it, I just took a pause on dosing, then started up again at a lower dose, as a lower D3 dose is needed the less fat we are carrying around. D & K2 are fat-soluble, so take these supplements with a fatty meal. Magnesium is water soluble, so scheduling time of day for that dose is much freer. Most Americans are far too low in all three of these nutrients/hormones.
(I also managed to encourage my elderly PhD of Nursing mother with COPD to take D3, K2 & Mg, and her constant coughing and breathlessness has disappeared! At her age of 85, she takes 10,000IU of D3 with 200mcg K2 along with Mg glycinate 4oomg? Her D blood level is now around a sleep healthy 60ng/ml and she sleeps through the nights again. But everyone is different, so NEEDS TO TITRATE DOSE TO OWN BODY/BRAIN NEEDS. Please test D blood level regularly and take the dose you need to get to your target LEVEL. It is so important for so many conditions.)