99.3% of People Who Tested Had At Least One Out-of-Range Biomarker. Most Already Had a Supplement Routine.

99.3% of Healf Bloods members had at least one out-of-range biomarker on their first test.

Most of them were already health-conscious. Most already had a supplement routine. Most were eating well, moving regularly, doing the right things.

The issue wasn't effort. It was that they were working off general advice — and general advice has a ceiling.

Why general advice stops working

Magnesium helps with sleep. Vitamin D matters. Iron is important. All true, at a population level. Whether any of it is addressing something you're actually deficient in, at the form and dose your body absorbs best, is a completely different question.

The supplement industry is built on this gap. Formulated for the average person. You are not average. And the one or two markers where you're not average are often exactly the ones driving the symptoms you can't explain — the fatigue you've been putting down to stress, the recovery plateau you've been blaming on age.

What the data actually shows you

Ferritin — stored iron — can sit low enough to cause fatigue, poor concentration, and low mood without triggering any flag on a standard NHS panel. Your GP might say your iron looks fine. Your ferritin might be quietly explaining everything you've been unable to account for.

Free testosterone in men is the fraction the body can use. Total testosterone can look normal while free testosterone sits at the low end — enough to affect recovery, motivation, and body composition in ways that are real but hard to trace.

Vitamin D is one of the most widely supplemented nutrients in the UK and one of the most commonly under-dosed. The amount you need to correct a deficiency depends entirely on where you're starting. A standard dose when you're significantly deficient doesn't fix it. It just barely maintains it.

The pattern is consistent: general advice gets you close. Your specific numbers are what get you there.

What Healf Bloods tests

• 37 biomarkers across hormones, thyroid, inflammation, metabolic health, vitamins and minerals, cardiovascular markers, and iron stores
• No clinic, no waiting room — Tasso device to your upper arm at home, no needles or finger-prick
• Results in 72 hours — plain-English dashboard, what each marker means and what to do about it
• 1:1 nutritionist consultation included — built around your specific results, not a generic protocol
• Annual membership for tracking over time as you adjust

On cost

Healf Bloods Core is £199. The average health-conscious person spends £40-£100 a month on supplements — £400 to £1,200 a year — mostly without any confirmation that any of it is addressing a real need.

One test that tells you what's working, what isn't necessary for you right now, and what's genuinely missing. Most people find the first round pays for itself in supplements they stop buying.