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Short Summary
Main recommendation: Take vitamin D3 together with magnesium glycinate, vitamin K2 (MK-7), and supporting cofactors as a comprehensive package, and check your blood vitamin D levels to guide dosing. Dr. Jin Sung explains that magnesium is required for vitamin D to be activated and transported, and that without enough magnesium, vitamin D can cause calcium imbalance and side effects.
Key Points
- Magnesium is required at several steps of vitamin D activation: the liver enzyme 25-hydroxylase, the kidney conversion to active 1,25-dihydroxy vitamin D, and the binding protein and receptors that move vitamin D into cells.
- Without adequate magnesium, vitamin D raises calcium absorption without the balance needed to handle it, which the speaker says can cause muscle twitching, headaches, kidney stones, and heart palpitations.
- The speaker suggests that people who are intolerant of vitamin D may try two weeks of 400 to 500 mg magnesium daily, then retry vitamin D with magnesium.
- Dietary magnesium (RDA of 310 to 420 mg) is described as usually inadequate, so many people may be magnesium deficient.
- Several factors can reduce vitamin D absorption, including low stomach acid (aging, H. pylori, antacid use), gallbladder removal, low digestive enzymes, GI conditions such as Crohn's disease, ulcerative colitis, or SIBO, skin color, and liver or kidney disease.
Details Worth Noting
- Concrete instructions: Take 5,000 IU of vitamin D3 after or with a fatty meal. Take 90 to 100 mcg of vitamin K2 as MK-7. Take 200 to 500 mg of magnesium glycinate daily, depending on dietary intake. Add a high-quality fish oil (EPA and DHA) or algae oil. Take vitamin B6 as P5P, 20 to 40 mg daily. Take boron, 7.5 to 15 mg. Take zinc, 2 to 4 mg. Calcium is generally not needed as a supplement if the diet is calcium-rich, such as eating sardines.
- Dosing rule of thumb: aim for about 100 mg of magnesium per 1,000 IU of vitamin D3 (for example, 400 to 600 mg magnesium with 5,000 IU D3, as the speaker states).
- Blood level target: the speaker's ideal is 60 to 80 ng/mL (150 to 200 nmol/L in European units). To convert, multiply ng/mL by 2.5. Check blood levels regularly.
- Supplement quality: the speaker recommends third-party tested products and warns against calcium carbonate as a calcium source and against cheap one-a-day multivitamins, which he says may be largely wasted.
- Dr. Sung notes that his online store is a curated selection of roughly 300 vetted companies, not his own formulation, and that products are tested for heavy metals and oxidation.
Bottom Line
Vitamin D works best when paired with adequate magnesium and cofactors, and blood testing helps determine whether absorption or dosing needs adjustment.
