D3/K2
The short answer. There isn't much data on D3/K2 yet — 19 mentions, 3 with a clear outcome — so treat these numbers as anecdotal.
From 19 mentions in total — the rest didn't say how it went and aren't counted.
What D3/K2 does, according to users
Of the people who reported each effect, the share who said it got better.
What the research says
Systematic reviews and meta-analyses from PubMed, with their published conclusions.
Dosage people report
As stated by users — not a recommendation. Follow the label or your doctor.
Reported side effects
How often each side effect came up across all reports.
What users say
First-hand experiences, quoted verbatim. We show one positive and one negative where both exist.
“I use d3+k2+omega3 daily. All 10/10 very effective honestly.”
Top discussions (5)
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- What would you tell your 40 year old self? ↗
- I compared Andrew Huberman, Rhonda Patrick, & Brad Stanfield's nootropic stacks - the overlap is tiny! ↗
- To my fellow ADHD'ers who take stimulants - what's your stack? ↗
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Other options for focus
User data from public discussions; research from PubMed. Information only, not medical advice — talk to a doctor before starting, stopping or combining anything. Data updated October 3, 2026. How we rate