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Vitamin D: 4,000 IU Is the Ceiling, Not the Goal Supplement feeds keep pushing the dose up: 5,000, 10,000, even 50,000 IU. But 4,000 IU is the tolerable upper limit — a safety ceiling, not a target. Official guidelines put healthy adults at 400-800 IU/day, and real toxicity cases took extreme doses for months. In this video: 1. Why doses keep inflating (marketing math) 2. What the UL actually means 3. What real overdose cases look like 4. Test your 25(OH)D first, then decide with your doctor ⚠️
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