We third-party test every batch.

A sample from every batch we make is sent to an independent laboratory with no ties to us, including SORA Laboratories, RSSL, Normec i2 F.A.S.T, Mérieux NutriSciences and Alkemist Labs. Depending on the product, the lab checks the active ingredient (for example the FU activity of our Nattokinase, or the magnesium content of our Pure Magnesium Glycinate), heavy metals and microbiology. Every certificate is published at testing.nfsupplements.co.uk, and the QR code on your bottle takes you to the report for your batch.

Three things. We make every product ourselves, in our own GMP-certified facility in Kidlington, Oxford, in the UK, rather than buying it in from a contract manufacturer. Every finished batch is tested by an independent lab before it ships. And every result is published, so you can check the batch in your hand instead of taking the label on trust.

In our own GMP-certified facility in Kidlington, Oxford, in the UK. Making our own products means we control the dosing, the ingredient sourcing and the quality of every batch, and it's why we can publish the testing data for each one. US orders ship from our warehouse in Texas.

In some formulas, yes: a small amount of magnesium stearate as a flow agent and brown rice flour as a bulking agent, so every capsule is filled accurately. Both are widely used in supplements and medicines. We don't use titanium dioxide or synthetic colors, and every batch, fillers included, is tested for heavy metals and microbiology. We explain the full reasoning in this video.

It depends on what you want to support. The product cards above show what each one is for, and our Shop All page compares them side by side. Still unsure? Email info@nfsupplements.co.uk and tell us what you're looking for.

Supplements work through steady daily use, not overnight. Take them consistently and give either formula at least 8 to 12 weeks before judging it. If there's something specific you want to track, ask your doctor what's worth measuring.

Always check with your doctor or pharmacist first. Take particular care with blood-thinning medication if you're considering Nattokinase. Our products are dietary supplements, not a substitute for medical advice.

Nattokinase is an enzyme first isolated from natto, a traditional Japanese fermented soybean food. It's measured in fibrinolytic units (FU) rather than milligrams, because enzyme activity varies between manufacturers. That's why the FU number matters more than the capsule weight, and why we test the FU activity of every batch.

Subscribe on either product page to save up to 46% compared with the one-time price, depending on the product and plan. Our 3-month magnesium subscription also comes with a free bottle of Vitamin D3 & K2 on your first order. You can skip, pause or cancel any time from your account.

Yes. Your first order is covered by our 90-day satisfaction guarantee: if you're not happy, contact us within 90 days of receiving it, subject to our refund policy.

We ship across the US from our warehouse in Texas. Standard delivery takes 3 to 5 working days, and the delivery options and price for your address are shown at checkout before you pay.