Does turmeric need fat to absorb? What the human trials actually tested

Almost every turmeric recipe tells you to add a little oil or milk "to help absorption", and it's one of those tips repeated so often that hardly anyone checks where it came from.

Does turmeric need fat to absorb? Curcumin dissolves in fat rather than water, so the advice makes chemical sense, but the human evidence is thinner than it sounds. In a crossover trial of 31 adults, curcuminoids dissolved in rice oil were absorbed no better over 24 hours than plain powder.

Key takeaways

• Curcumin is fat-soluble, which means it dissolves in fat and barely at all in water.
• No human trial has yet compared turmeric taken with fat against turmeric taken without it.
• Black pepper and specially formulated curcumin have clear trial results behind them, and plain oil so far doesn't.
• Whole turmeric has been absorbed far better than purified curcumin, even when both were eaten in the same creamy meal.
• Having your turmeric with breakfast is still sensible, because food is kinder to your stomach and makes the habit easier to keep.

Why do people say turmeric needs fat?

Because curcumin is fat-soluble, and that part is true.

Fat-soluble is defined as able to dissolve in fat or oil but not in water. Curcumin and the other curcuminoids behave that way: the trial above describes them as lipophiles with low solubility in water. The NHS guidance on fats explains that fat helps the body absorb vitamins A, D, and E, which are fat-soluble in the same sense, so it's a natural step to assume curcumin works like a vitamin.

It's a reasonable step, and it's why our guide to how to take a turmeric shot suggests a breakfast with some fat in it, and our guide to curcumin absorption calls it the least controversial tip going. What gets said less often is how little of it has been tested directly.

Does turmeric need fat to absorb, according to the trials?

No trial has isolated fat as the variable, so there's no direct answer yet.

The closest test is that crossover trial, run at the University of Sherbrooke in Canada. Its 31 volunteers took 400mg of curcuminoids three ways: as plain powder, dissolved in rice oil, and combined with a specially made omega-3 compound. Over 24 hours, the rice oil version wasn't absorbed any better than the powder. The omega-3 compound gave blood levels 40% higher at the one-hour mark before the three evened out. The company that made that compound supported the trial.

A study at Massey University in New Zealand came at it from another angle. Healthy men ate a meal of mashed potato and cream carrying 400mg of curcumin from one of three sources: grated fresh turmeric, ground turmeric, or purified curcumin powder. Every version came with the same creamy meal, yet the purified curcumin barely registered in the blood, while both forms of whole turmeric gave far higher levels. The researchers put the difference down to other compounds in turmeric, or the root itself, helping curcumin along.

Note the dose, though. 400mg of curcumin is far more than a seasoning's worth of ground spice, so this was a test of the root, not a case for cooking with more powder. What it does suggest is that the rest of the root matters more than the fat on the plate.

What actually improves curcumin absorption?

Black pepper and clever formulation, which are the two with the clearest trial results.

Black pepper comes first because it's the simplest. In the 1998 study that put piperine on the map, adding the compound that gives pepper its bite took curcumin from barely detectable in the blood to clearly measurable. Our guide to turmeric and black pepper explains how.

Formulation is where the biggest numbers come from. A crossover study of curcumin bound to phospholipids, the fat-like molecules in lecithin, found about 29 times the absorption of unformulated curcumin; the product's maker was involved in that work. A University of Hohenheim study of 23 adults found curcumin packed into tiny liquid droplets called micelles was absorbed about 185 times better than plain powder. These are carriers engineered in a lab, which is a long way from a spoonful of oil in a pan.

So should you take turmeric with food?

Yes, and for more reasons than the fat.

Turmeric is generally well tolerated, and the side effects people do notice tend to be mild stomach ones, which food helps with. A meal also softens a pungent shot, and tying turmeric to breakfast is the easiest way to remember it every day. If that breakfast includes yoghurt, eggs, nuts, or a drizzle of olive oil, so much the better: the chemistry points that way, it costs nothing, and the NHS reminds us a small amount of fat is an essential part of a healthy, balanced diet anyway.

Just don't expect a splash of oil to do the work black pepper does. Our guide to turmeric side effects covers who should take extra care, and anyone on prescription medicines should speak to their pharmacist or GP before taking turmeric every day.

Do our shots contain fat?

There's no added oil in them, and we'd rather say so plainly.

Raw Turmeric Original is a cold-crushed, whole watermelon-based blend, with raw turmeric root making up 30% of the shot, the most in our range, alongside pineapple, lemon, magnesium, and vitamin C. What it does carry is the part with the evidence: our trade-secret BioMax Uptake Blend®, which includes black pepper, at a 0.1% inclusion. And it starts from the whole root rather than from purified curcumin, which is the form that did better in that New Zealand meal study.

One of our blends does include a fat-like ingredient. Raw Turmeric & Vitamin C & D3 carries our Lipoturm© blend of vitamin C, vitamin D3, vitamin E, and sunflower lecithin, and D3 and E are both fat-soluble vitamins.

When independent researchers at Nottingham Trent University ran the first clinical trial of our blends, 16 professional footballers drank two Raw Turmeric Original shots a day, and they had lower CRP, a marker of inflammation, and less muscle soreness after matches than the eight players who didn't. We're clearly not a neutral party, and it was a small study in young athletes.

The takeaway

Does turmeric need fat to absorb? Curcumin is fat-soluble, so a little fat in the meal makes sense, but no trial has shown that fat on its own makes much difference, and plain oil didn't help in the one trial that tried it. Black pepper and the whole root are where the evidence points.

So have your turmeric with breakfast, fat and all, and let the pepper do the real work. Raw Turmeric Original has both built in, cold-crushed raw root and our BioMax blend, and it's gone in one swallow.

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