Ginger Benefits: Human Studies, Doses Studied and Safety

Ginger is the underground stem (rhizome) of Zingiber officinale, used as food and as a supplement. Human studies are strongest for nausea in pregnancy and look promising but weaker for menstrual cramps, knee osteoarthritis, blood pressure and blood sugar. For weight, the main measures did not improve, and much of the research is small, short or of uneven quality, so it is not "proven" for most uses people ask about.

Quick facts

What do human studies show?

Most findings below come from meta-analyses, which pool many trials; our guide to meta-analyses and systematic reviews explains how. Several describe "heterogeneity", meaning the trials disagreed with each other, which lowers confidence in the average result.

Nausea and vomiting

NCCIH, a US government research agency, summarizes the research in its ginger fact sheet. It says ginger may be helpful for nausea and vomiting in pregnancy. It says most studies of motion sickness have not shown benefit. For chemotherapy-related nausea and for nausea after surgery, NCCIH calls it uncertain whether ginger helps. NCCIH gives no trial counts for these. It lists a meta-analysis that compared ginger with vitamin B6 and placebo in pregnancy, but its summary does not give that comparison’s result. Ask your clinician before using ginger for pregnancy nausea or alongside any nausea medicine.

Harvard Health describes ginger as an effective and safe treatment for nausea, including from chemotherapy, and also for motion sickness. That is more confident than NCCIH, so treat the NCCIH wording as the more cautious reading, particularly for chemotherapy and motion sickness.

Menstrual cramps

NCCIH says research suggests ginger supplements might reduce the severity of menstrual cramps. It cites a meta-analysis of ginger for primary dysmenorrhea but gives no sizes or results on its page. The wording is "might".

Knee osteoarthritis

NCCIH says ginger supplements might help knee osteoarthritis symptoms, but much of the research has been of poor quality. Ginger applied to the skin has not been shown to help knee osteoarthritis symptoms. Harvard Health cites a review in Phytotherapy Research reporting that eating or applying ginger could ease pain and inflammation tied to premenstrual syndrome, muscle soreness after exercise, knee osteoarthritis and migraine.

Blood pressure

A 2026 meta-analysis of 12 randomized trials found ginger supplements lowered systolic (top number) blood pressure by about 5.0 mmHg (95% CI -8.49 to -1.57) and diastolic by about 2.0 mmHg (95% CI -3.90 to -0.15). The authors rated the certainty as low. They cited inconsistent results, short trials, and limited robustness of the diastolic finding. The effects were clearer in people with elevated baseline blood pressure, in people with obesity, and in trials using 2,000 mg a day or more. The authors say longer, higher-quality trials are needed before dosing or clinical recommendations.

Blood sugar and blood fats

A 2026 meta-analysis of 13 trials in people with type 2 diabetes compared ginger with placebo. Ginger was linked to lower fasting blood sugar (about 16 mg/dL), lower HbA1c (about 0.41 percentage points), lower triglycerides (about 17 mg/dL), slightly lower systolic pressure (about 1.6 mmHg) and slightly higher HDL cholesterol (about 2 mg/dL). It did not significantly change insulin resistance, diastolic pressure, total cholesterol, LDL cholesterol or BMI. The authors themselves say the size of these effects was of limited clinical importance, and the trials varied widely (I-squared above 80% for most results).

A 2025 systematic review of 41 trials of cardiovascular disease markers found similar small shifts: fasting blood sugar (about 13 mg/dL lower), HbA1c (about 0.68 points lower), LDL (about 4.6 mg/dL lower), triglycerides (about 12 mg/dL lower) and systolic pressure (about 2.7 mmHg lower). The effects were stronger in people who were not healthy to begin with. The authors say the best dose and duration remain unsettled.

These are lab and measurement numbers, not heart attacks or strokes. Our guide on surrogate outcomes explains why a better number does not automatically mean better health.

Inflammation and antioxidant markers

A 2025 meta-analysis of 29 trials found ginger supplements were linked to lower C-reactive protein (about 0.86 mg/L), TNF-alpha and IL-6, and to improved antioxidant measures. The authors note high heterogeneity and say results should be read cautiously, especially because benefits showed up mainly in people with underlying health conditions. These are blood markers, not symptoms or disease outcomes. Harvard Health says ginger has anti-inflammatory properties and that researchers are investigating possible heart and blood vessel protection. Its claims for conditions such as ulcerative colitis, Crohn’s disease and lupus are broad, and NCCIH does not list them as established uses.

Does ginger reduce belly fat?

Not in any way that shows up on the scale. A 2025 meta-analysis of 36 trials found ginger supplements did not improve body weight or BMI. They were linked to a small drop in waist circumference (about 0.65 cm) and body fat percentage (about 1.5 points). The authors concluded ginger does not seem effective for major weight measures, and said longer studies are needed. A waist change under a centimeter is small.

Doses used in studies

This describes what researchers used. It is not a suggested amount. The only dose threshold in the reviews above is from the blood pressure analysis, where the clearest effects were in trials giving 2,000 mg a day or more. The reviews of cardiovascular and inflammation markers found that dose and duration may change results in non-linear ways, and the authors say no clear best dose or duration has been established. NCCIH’s page does not list doses for nausea, cramps or knee pain. If you want to know what a particular study used, open its trial listing and look for the daily amount, the form (powder, extract, capsule) and how many weeks it lasted. A clinician or pharmacist can tell you what applies to you.

Safety, side effects and interactions

NCCIH’s page does not name specific drugs to avoid with ginger, so for "what not to mix it with", give your pharmacist or clinician your full medicine and supplement list and ask. NCCIH offers a guide called Know the Science: How Medications and Supplements Can Interact on its site.

Common questions about everyday use

What happens if I eat ginger every day, or drink warm ginger water for 7 days?

The studies above tested supplements, not morning ginger water, so their results cannot be applied to a one-week routine. What is documented is the side effect list: stomach discomfort, heartburn, diarrhea and mouth or throat irritation. If you notice these, that is information to share with a clinician. Harvard Health describes making tea by steeping sliced fresh ginger in boiling water for up to 10 minutes, and notes that many commercial ginger drinks are high in sugar.

Is chewing raw ginger healthy, and what is the healthiest form?

Fresh ginger is a normal food, and Harvard Health says fresh, dried, ground and preserved forms can all be used. No source here ranks one form as healthiest. Harvard says ginger powder has similar benefits to fresh ginger but slightly less anti-inflammatory impact, and that supplements may have reduced amounts of some compounds. NCCIH lists mouth and throat irritation as possible side effects of ginger taken by mouth.

Which is better, turmeric or ginger?

No source here compares them directly in the same trial, so no honest winner can be named. Each has its own research and limits; see our page on curcumin and turmeric research. Online forum posts promoting combinations of the two are opinions, not evidence.

Who should talk to a clinician first?

• Anyone who takes prescription or over-the-counter medicine, because NCCIH warns that some herbs and medicines interact in harmful ways.
• Anyone pregnant or breastfeeding. NCCIH says supplements may be safe in pregnancy but advises consulting a provider, and says little is known about breastfeeding.
• Anyone managing blood pressure, blood sugar or cholesterol with medicine, since studies measured these and your clinician needs to know about any supplement. Do not change a prescribed medicine on your own.
• Anyone with heartburn or digestive problems, since heartburn and diarrhea are listed side effects.
• Anyone considering ginger for chemotherapy nausea or after surgery, where NCCIH calls the evidence uncertain.

What is still unknown?

• The best form, dose and duration for any condition.
• Whether small lab-marker changes lead to fewer heart, diabetes or other health events. Most reviews relied on markers and short trials.
• Whether food-level amounts of ginger do what supplement-level amounts did in trials, since most studies used supplements.
• Long-term safety and safety while breastfeeding.
• How ginger compares directly with other remedies or medicines. Ginger is not a substitute for prescribed treatment.

For a framework on judging all of this, see our guide to evaluating evidence quality.

How to read a label that lists ginger

• Amount: look for milligrams of ginger per serving and servings per day, so you can compare with what trials used. A label that says only "ginger" with no amount tells you little.
• Form: fresh root, dried powder and concentrated extract are different things. Study results do not automatically carry across forms.
• Blends: if ginger sits inside a blend that lists only one combined total, you cannot tell how much ginger you are getting, so you cannot compare it to any study dose.
• Quality seals: Harvard Health says the FDA does not regulate the content of supplements and suggests looking for a seal from NSF International or the U.S. Pharmacopeia. NCCIH adds that supplements are not approved by the FDA before sale.
• Claims: the FDA has sent a warning letter to a seller of ginger syrups whose cough, flu and inflammation claims made them unapproved drugs. Language about curing or preventing disease is a red flag. Our guide to ingredient evidence versus marketing claims helps with this.

The NIH Office of Dietary Supplements (ods.od.nih.gov) publishes a guide to supplements for consumers.

Before you order or start

• Which form and daily amount does the product give, and how does it compare with the trial you are relying on?
• Is ginger’s own amount listed, or is it hidden in a blend?
• Have you told your pharmacist or clinician about every medicine and supplement you take?
• Are you pregnant, breastfeeding or planning surgery or chemotherapy? Ask first.

By ClinicalStudyConnect.com Research Desk