Supplement · Vitamin
Cholecalciferol (D3)
The vitamin the body makes from sunlight. Reviews, side effects and research on vitamin D from parents of autistic and ADHD kids.
1 reviews · 1 languages · collected October 2026
The reviews so far were written by parents in Japan (1).
Of 1 reviews, 0 said things got better and 0 said they got worse.
No one reported things getting worse
Only 1 reviews so far, so treat the percentages as a rough guide.
Not enough reviews yet
Not enough reviews yet
1
Boy · ADHD & autism
🇯🇵 Japan · Japanese · Dec 4, 2021
A parent of a young elementary-school boy with ADHD and autism reports giving vitamin D as part of nutritional therapy. Blood levels stayed low, so the dose was raised, and no clear improvement was seen.
Small improvement
53 PubMed papers · 256 participants
In ADHD, vitamin D added to methylphenidate gave a small symptom improvement, but the evidence quality is low. For autism, the benefit is still unclear.
Key studiesPMID 31368773PMID 38547138PMID 42363206PMID 35311615
Read this apart from parent experience. Studies average many children, so they may not match your child.
The one review we collected mentions no side effects. That doesn't mean there are none.
Call emergency services or go to the ER right away if your child
If an unusual change lasts more than a few days, tell your child's doctor.
We only pick posts in which parents describe trying something with their own child, from public parent forums and personal blogs. We don't copy the posts: we pull out the result, duration and side effects, write a short summary, and link every review to its original. These are parents who chose to write, so the numbers may differ from the real picture.
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