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Source Naturals NSK-SD Nattokinase is a 30-capsule supplement delivering 200 mg of NSK-SD nattokinase per capsule, a fermented soy enzyme standardized for fibrinolytic activity. NSK-SD is the branded Japanese ingredient most clinical research on nattokinase uses, which sets it apart from generic nattokinase powders sold without a named source. It suits adults interested in circulatory and cardiovascular support who prefer a capsule to fermented soy foods. Compared with enzyme blends that add other ingredients, it is a single-ingredient product, so the dose of the active enzyme is easy to track.
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Lowest price we've seen: $23.79 on Nov 11 at Herbspro. Tracked across 1 store since Nov 11.
Owners of NSK-SD nattokinase generally report it is easy to take and trust the branded ingredient, while some say they notice no clear difference and dislike the small bottle.
