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this post was submitted on 27 May 2025
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Most multivitamins/supplements/whatever have WAY more than the recommended daily amounts.
Sure, but going over 100% "daily value" does not equal toxic. You generally have to be taking well over 4000 IU vitamin D daily to reach toxic levels.
Having known people who prefer supplements to actual medical care, I can attest to "megadosing" of vitamins being common in these communities.
I admit I don't know at what point the dose becomes unsafe, but I'd imagine that taking a 1000 IU tablet daily plus the additional natural vitamin D intake could be problematic longterm.
For healthy adults, it's safe
https://en.m.wikipedia.org/wiki/Vitamin_D_toxicity
Thanks, it looks like vitamin D is definitely one of the harder ones to get too much of naturally.
Other sources suggest much lower upper limits, but still a lot higher than you're going to get via sunlight and diet.
This study found 3.2% of participants were getting over 4,000 IU daily in 2013-2014 (vs <0.1% about a decade prior). That trend of increased intake has probably continued, so stats for a more recent year would be pretty interesting.
I also didn't realise you could get vitamin D supplements as high as 10,000 IU without a prescription, so I'm sure there will be people taking that regularly without good reason to do so.
Seems safe based on this doc. https://youtu.be/uAfVC4l5uZ0 but it seems like need other nutrients that works with d3 to keep it safe or beneficial for the body.
RDA value is just the min required to prevent disease. The toxicity level is much higher.
RDA is min required to prevent disease. There is also a max dosage, upper limit, after which it is toxic.