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To achieve blood levels of at least 30 ng/mL, adults living at temperate latitudes (think: anywhere with distinct seasons) need 800 to 1,000 IU per day, ideally from vitamin D3, which is more effective than D2
Due to possible changes, we always recommend checking the ingredient list directly on the packaging.
J Virol 1999
Benefits of IV Therapy Oral supplements lose up to 80 percent of their efficacy during gastrointestinal digestion
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