Klair Labs Nattokinase NSK-SD® Review

While we refer to this product as Nattokinase by Klaire Labs, it appears the brand is transitioning to the name SFI Health. This supplement offers a similar dosage to our top pick, delivering 200 mg of Nattokinase per day with a potency of 4,000 FU. The daily dose is split between two capsules, giving users the flexibility to follow dosing recommendations from their healthcare provider. However, unlike our top pick, this formula does not include BioPerine® to support nutrient absorption and comes with only a 30-day refund policy.

Is Klair Labs Nattokinase NSK-SD® Effective?

As the name indicates, this product contains NSK-SD®, a patented and clinically studied form of Nattokinase. Based on that, we expect it to be effective. It’s also free from Vitamin K2, which means fewer concerns about potential interactions.

Beyond the formula itself, we also consider customer reviews to gauge real-world effectiveness. This product has a 4.7-star rating on Amazon, with most reviews being positive.

Is Klair Labs Nattokinase NSK-SD® Safe?

This supplement is likely safe for most users, thanks to its GMP certification and use of a well-researched, third-party tested active ingredient. That said, we did not find any mention of testing done on the full formula. This is worth noting, especially since Klaire Labs previously recalled a product in 2013 due to contamination. As always, we recommend consulting your doctor before starting any new supplement, particularly to ensure it aligns with your personal health needs.

Summary

Despite past concerns regarding a product recall, Klaire Labs offers a Nattokinase supplement with an ideal dosage and the clinically supported NSK-SD®.At $42 for 60 capsules (2,000 FU each), it’s slightly cheaper than our top pick, but that value is diminished somewhat by the lack of bulk discounts and the absence of BioPerine for improved absorption. Taking everything into account, Klaire Labs Nattokinase NSK-SD® secured the second spot on our list.

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