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Both products contain the same pharmaceutical-grade nattokinase enzyme — the only difference is the dose per capsule. The 5,000 FU is our standard everyday strength, ideal for ongoing daily cardiovascular support. The 10,000 FU is a double-strength option for people who want a higher dose in a single capsule, or who are following protocols recommending higher daily activity units. Both are manufactured in the same GMP facility and third-party tested to verify potency.

Nattokinase is an enzyme originally isolated from natto — a traditional Japanese fermented soybean food. It has been studied for over three decades for its role in supporting healthy blood flow, circulation and arterial function. It's measured in Fibrinolytic Units (FU) rather than milligrams because potency varies between manufacturers depending on fermentation and purification — which is why the FU number matters more than the capsule weight.

Our Cholesterol Support combines standardised red yeast rice extract with organic reishi mushroom extract. Red yeast rice has the longest human track record of any natural ingredient studied for cholesterol support, and reishi is included for its complementary role in cardiovascular and immune health. The full per-capsule dosage and the assay certificates are published on our testing database.

Most "magnesium glycinate" products on the market are buffered — meaning they're blended with cheap magnesium oxide to hit a higher elemental magnesium number on the label at lower cost. Oxide is poorly absorbed and commonly causes digestive upset. Ours is fully-reacted, unbuffered magnesium bisglycinate with no oxide, no stearates, and no fillers. The raw material cost is several times higher, and the difference shows up in tolerability and absorption.

All of our current formulas are suitable for vegetarians, and most are fully vegan. Capsule shells are plant-based HPMC (hydroxypropyl methylcellulose), not gelatin. Specific allergen and dietary information is listed on each product page.

Yes — our formulas are designed to be stackable, which is why we offer the Cardiovascular Stack. The three cardiovascular products (Nattokinase, Blood Pressure Support, Cholesterol Support) work on different but complementary pathways. Magnesium Glycinate pairs well with any of them and is typically taken in the evening. If you're on prescription medication, always check with your GP first — particularly blood thinners, blood pressure medication, and statins.

Nattokinase is best taken in the morning on an empty stomach for maximum enzyme activity. Blood Pressure Support and Cholesterol Support are taken with food, usually with the main meal. Blood Sugar Support is most effective taken 15–20 minutes before a carbohydrate-heavy meal. Magnesium Glycinate is best in the evening, 30–60 minutes before bed, to support sleep and muscle relaxation.

It depends on the product and what you're measuring. Magnesium Glycinate often produces noticeable effects on sleep and muscle tension within the first week. Cardiovascular outcomes — blood pressure, cholesterol, circulation — are physiological changes that take longer, typically 8–12 weeks of consistent daily use. We recommend giving any cardiovascular formula at least a full 3-month cycle before judging it, and tracking objective markers where possible.

Always check with your GP or pharmacist before adding any supplement if you're on prescription medication. Particular care is needed with: blood thinners (relevant for Nattokinase), statins (relevant for Cholesterol Support), antihypertensives (relevant for Blood Pressure Support) and diabetes medication (relevant for Blood Sugar Support). We're a supplement company — we're not here to replace medical advice, just to offer well-formulated, honestly-dosed products.

Everything is manufactured in our own GMP-certified facility in Kidlington, Oxford. Most UK supplement brands outsource manufacturing, which means they don't control dosing accuracy, ingredient sourcing, or batch quality. We do. It's the reason we're able to publish testing data on every single batch.

Yes — every batch of every product is independently tested by SORA Labs, an ISO 17025:2017 accredited laboratory. We test for active ingredient potency, heavy metals, microbial contamination, and in the case of nattokinase, verified FU activity. Results are published in full on our public testing database at testing.nfsupplements.co.uk. We're the only UK supplement brand publishing per-batch certificates of analysis at this level.

Honest answer: yes, in some formulas we use small amounts of magnesium stearate as a flow agent, and organic brown rice flour as a bulking agent to hit accurate capsule fill weights. Both are safe, well-studied, and used across the supplement and pharmaceutical industries — the "stearate scare" online is built on misreadings of a single in-vitro mouse study that's been repeatedly debunked. We've explained the full reasoning in this video: Why we use magnesium stearate and brown rice flour. We don't use titanium dioxide or synthetic colours, and every batch — fillers included — is third-party tested for heavy metals and contaminants.

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UK orders placed before 2pm typically ship same day via Royal Mail Tracked 24/48. Free UK shipping on orders over £40. EU orders ship from our Oxford facility; US orders ship from our US fulfilment partner to keep delivery times and duties reasonable.

We offer a 60-day money-back guarantee on all products — open the bottle, try it properly, and if it's not working for you, email support@nfsupplements.co.uk for a refund. No interrogation, no restocking fees.