9
User score
Not enough data0% positive0% mixed0% negative100% unclear
Of reports that state an outcome, 0% are positive.
Clinical research
Research pending
What Natto does, according to users
Of the people who reported each effect, the share who said it got better.
No specific effects reported yet.
betterno changeworse
What the research says
Systematic reviews and meta-analyses from PubMed, with their published conclusions.
Research data for Natto is being compiled.
Dosage people report
As stated by users — not a recommendation. Follow the label or your doctor.
dailyas reported
Reported side effects
How often each side effect came up across all reports.
No side effects reported so far.
What users say
Verbatim quotes, shortened only — each links to the original discussion.
“I buy natto as well because making natto is pretty hard.”
“I want to put in a plug for natto, the best widely available dietary source of Vitamin K2.”
“I rotate between kimchi, natto and sauerkraut(refrigerated jar version).”
“Natto tastes fine lol. Some soy sauce, chopped green onions and a little bit of spicy mustard and it tastes EXTREMELY good.”
“The only plant source of Vitamin K2 would be natto (fermented soybean) and that isn't even in the correct MK form we need”
Top discussions (5)
- Which foods do you eat every single day for nutritional/biohacking purposes? ↗
- We all dislike the term superfood but which are some really extraordinary foods(either contain a substance you don’t meet often, significant quantities or something else )? ↗
- Is there an upper limit on Vitamin K supplementation, which if exceeded, can cause problems? ↗
- Vitamin K2 and its 13 children ↗
- High dose D3 for years without K2 = Arterial calcification ? I'm scared ↗
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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 2, 2026. How we rate