Short answer: Maybe. Curcumin, the main active compound in turmeric, protects brain cells in lab and animal studies. Human evidence is preliminary: one small 18-month trial found better memory, and a meta-analysis found a small benefit in older adults but none in Alzheimer’s disease. Cook with turmeric freely, and ask a doctor before taking curcumin supplements.

Turmeric might help the brain, but the evidence in people is still preliminary. The best human data come from one trial of 40 adults and a meta-analysis of six small trials.

How to use turmeric

  • In cooking: Use 1/2 to 1 teaspoon in a dish. Curries, soups and a golden turmeric latte are easy ways to eat more. Culinary amounts are safe and add to an anti-inflammatory diet.
  • With fat and black pepper: Curcumin is fat-soluble, so cooking it with oil helps absorption. Black pepper helps too (see below).
  • As a supplement: The main trial used 180 mg of curcumin a day in a high-absorption form; other trials used higher doses. High-absorption and piperine-containing products are the ones most often linked to liver injury. Ask a doctor or pharmacist first, especially if you take medication, are pregnant or breastfeeding, or have a health condition.

What’s in turmeric

  • Curcumin: The main active compound. It has anti-inflammatory, antioxidant and nerve-protecting effects in cell and animal studies.
  • Turmerones: Aromatic compounds that may protect nerve cells on their own.
  • Demethoxycurcumin and bisdemethoxycurcumin: Two other curcuminoids with biological activity.
  • Volatile oils: They give turmeric its smell. Their effects in humans are not well studied.

What lab and animal studies show

In cells and animals, curcumin has:

  • reduced inflammation in the brain
  • raised levels of BDNF, a growth factor the brain needs for memory and learning (more in foods that increase BDNF)
  • reduced amyloid plaque formation in mice bred to model Alzheimer’s disease
  • protected nerve cells from oxidative damage
  • improved memory tasks in aged rodents

Most of these studies used doses far higher than people eat, or special forms of curcumin that the body absorbs better.

What human trials show

In an 18-month trial of 40 adults aged 51-84 without dementia (Small 2018), half took a high-absorption curcumin product (90 mg twice daily) and half took a placebo. Memory and attention improved more in the curcumin group. A brain scan in 30 participants showed lower binding of a tracer for amyloid and tau in some regions. But this tracer is not specific for amyloid plaques, and the trial was small.

Other results are weaker. A 2019 meta-analysis (Zhu 2019) found only six trials, with 289 people in total. It reported a small benefit on cognitive scores in older adults and no benefit in people with Alzheimer’s disease. The authors said larger, better trials are needed.

Why absorption is the main problem

The body absorbs little standard curcumin from the gut, then breaks it down and clears it quickly. Blood levels from normal cooking amounts are extremely low.

Some things improve absorption:

  • Black pepper (piperine): In a small study (Shoba 1998), 20 mg of piperine taken with 2 g of curcumin raised curcumin’s bioavailability about 20-fold (2000%).
  • Fatty meals: Eating curcumin with oil helps.
  • Phospholipid formulations: For example, curcumin bound to phosphatidylcholine.
  • Nanocurcumin and micellar formulations: Newer delivery methods.

Safety

  • Liver injury: Cases of liver injury, some severe, have been reported with turmeric and curcumin supplements. A US case series (Halegoua-DeMarzio 2023) found 10 cases, including one death. Three of the 7 products tested also contained piperine, and there was a strong link to the gene variant HLA-B*35:01. An Italian series (Lombardi 2021) linked cases to high-dose, high-absorption products. Avoid curcumin supplements if you have liver disease. Stop and see a doctor if you develop jaundice, dark urine or abdominal pain. Culinary amounts of turmeric have not been implicated.
  • Medicines: Curcumin supplements can interact with medicines. Ask a doctor or pharmacist first, especially if you take blood thinners or diabetes medication.
  • Blood thinning: High-dose curcumin has mild antiplatelet effects. If you take blood thinners, ask your doctor before using curcumin supplements.
  • Pregnancy: Culinary amounts are safe, but high-dose supplements are not recommended during pregnancy.
  • Gallbladder: Curcumin may make gallbladder disease worse in some people.
  • Iron: Curcumin binds iron in lab studies, but in a human study (Tuntipopipat 2006), turmeric added to a meal did not reduce iron absorption. If you have iron deficiency, ask your doctor before taking high-dose curcumin supplements.
  • Surgery: Stop high-dose curcumin supplements at least 2 weeks before surgery.

Turmeric is a reasonable part of the diet, but don’t rely on it as your main brain-health strategy. For supplements with stronger evidence, see our guide to brain health supplements.

Sources

  • Halegoua-DeMarzio, D., et al. (2023). Liver injury associated with turmeric: A growing problem. Ten cases from the Drug-Induced Liver Injury Network [DILIN]. The American Journal of Medicine, 136(2), 200–206. doi:10.1016/j.amjmed.2022.09.026
  • Lombardi, N., et al. (2021). Acute liver injury following turmeric use in Tuscany: An analysis of the Italian Phytovigilance database and systematic review of case reports. British Journal of Clinical Pharmacology, 87(3), 741–753. doi:10.1111/bcp.14460
  • Shoba, G., Joy, D., Joseph, T., Majeed, M., Rajendran, R., & Srinivas, P. S. (1998). Influence of piperine on the pharmacokinetics of curcumin in animals and human volunteers. Planta Medica, 64(4), 353–356. doi:10.1055/s-2006-957450
  • Small, G. W., et al. (2018). Memory and brain amyloid and tau effects of a bioavailable form of curcumin in non-demented adults: A double-blind, placebo-controlled 18-month trial. The American Journal of Geriatric Psychiatry, 26(3), 266–277. doi:10.1016/j.jagp.2017.10.010
  • Tuntipopipat, S., et al. (2006). Chili, but not turmeric, inhibits iron absorption in young women from an iron-fortified composite meal. The Journal of Nutrition, 136(12), 2970–2974. doi:10.1093/jn/136.12.2970
  • Zhu, L. N., Mei, X., Zhang, Z. G., Xie, Y. P., & Lang, F. (2019). Curcumin intervention for cognitive function in different types of people: A systematic review and meta-analysis. Phytotherapy Research, 33(3), 524–533. doi:10.1002/ptr.6257