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Natto

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Traditional Japanese fermented soybean paste that is high in vitamin K2 and naturally contains nattokinase enzyme.

japanese cardiovascular fermented foods vitamin k2
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Mentioned by

Chris Masterjohn

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Chris Masterjohn recommends ✓ High confidence
"Nattokinase is an enzyme derived from natto, which is a Japanese fermented soybean paste that is also incidentally very high in vitamin K2. Actually just eating natto would be better. This is why food first works, right?"
From: Joe Rogan Experience #2420 - Chris Masterjohn • ▶ 2:17:10 • Nov 2025

Attribution: Chris Masterjohn recommends natto as a food-first approach because it provides both nattokinase and vitamin K2, following his food-first philosophy.