16 Natural Pain Relievers From Plants: What Works and What’s Safe

16 Plants Promoted as Natural Pain Relievers: Evidence and Safety

Several plants really do contain compounds that ease pain, and a few have reasonable clinical evidence behind them. Willow bark for short-term low-back pain, turmeric for knee osteoarthritis and high-strength capsaicin patches for nerve pain are the best supported. Most of the other remedies on popular “natural painkiller” lists rest on small studies, traditional use or laboratory work, and some carry real risks.

This guide goes through sixteen plants and plant products often promoted for pain, grouped by how strong the evidence is, with the safety points that matter most. It is general information, not medical advice. If you live with ongoing pain, take other medicines, are pregnant or are choosing something for a child, talk to a doctor or pharmacist first, and never stop a prescribed treatment in favour of a herbal one.

Natural does not automatically mean safer

The appeal of plant remedies is easy to understand. Over-the-counter painkillers have known side effects, and opioids carry serious risks. But many of the plants on this list work precisely because they contain active drugs, and an active drug can harm as well as help. Willow bark contains salicin, a close relative of aspirin; wintergreen oil is almost pure methyl salicylate. Herbal products are also less tightly regulated than medicines, so the dose in a capsule can vary from brand to brand.

Diet does matter for overall health, and eating more vegetables, fruit, whole grains and oily fish fits every major nutrition guideline. However, there is no good evidence that cutting out “junk food” is a necessary first step before any pain treatment can work, as some wellness articles claim.

The best-supported options

1. White willow bark (Salix alba)

The US National Center for Complementary and Integrative Health (NCCIH) reports moderate-quality evidence, from a 2014 Cochrane review, that daily willow bark is probably better than a placebo for short-term low-back pain. Its salicin is converted in the body to salicylic acid. Because of that, it shares aspirin’s risks: stomach upset, a higher bleeding risk for some people and possible allergic reactions. Children, anyone pregnant or breastfeeding and people sensitive to aspirin should avoid it. Claims that it never irritates the stomach are wrong.

2. Turmeric (Curcuma longa)

Turmeric, the yellow spice in curry, is the source of curcumin. A 2021 review of ten studies with almost 1,300 participants found it may help knee osteoarthritis pain and function, with an effect similar to common anti-inflammatory drugs, though the best dose and formulation are still unclear. Evidence for inflammatory conditions in general is weaker. It is considered safe for most adults; high doses can cause indigestion, nausea or diarrhoea.

3. Capsaicin (Capsicum)

Capsaicin is the compound that makes chilli peppers hot. It binds to TRPV1 receptors on pain-sensing nerve fibres and, with repeated or strong exposure, overloads and desensitises them. A high-strength 8% patch, sold as Qutenza, was approved in the US and the EU in 2009 for nerve pain after shingles. A 2017 Cochrane review found the 8% patch gave moderate to substantial relief for some people with nerve pain after shingles, HIV-related neuropathy or diabetic neuropathy. Low-strength creams sting at first and need regular use; keep them away from eyes and broken skin.

4. Devil’s claw (Harpagophytum procumbens)

This southern African plant may modestly improve short-term low-back pain, according to low-quality evidence in a 2014 Cochrane review, and has some support for osteoarthritis, although long-term safety data are thin. Older claims that it treats liver problems or heartburn have no good support. NCCIH warns that it may affect heart rate, blood pressure and blood sugar, and should be avoided by people with gallstones or stomach ulcers.

5. Peppermint (Mentha piperita)

Peppermint’s strongest evidence is for the stomach pain and other symptoms of irritable bowel syndrome: a 2022 review of ten studies found enteric-coated peppermint oil capsules worked better than placebo, and a 2021 American College of Gastroenterology guideline recommends them. Peppermint oil rubbed on the forehead may relieve tension headaches, but the evidence is limited. It can cause heartburn.

Promising but unproven

6. Ginger (Zingiber officinale)

Ginger is a staple of Ayurvedic medicine, but its pain evidence is unclear. A 2020 analysis of seven trials found no convincing benefit for knee osteoarthritis, while a 2010 study of 74 people found daily ginger eased muscle soreness after exercise. Small amounts cause few problems; powdered ginger can bring gas, bloating or heartburn.

7. Holy basil (tulsi)

Holy basil is often grouped with ginger and turmeric in Ayurvedic tradition and is said to be anti-inflammatory. That reputation comes mostly from tradition and laboratory work; there is little good human research on it for pain.

8. Bromelain

Bromelain is a mix of enzymes from the pineapple plant. A 2019 analysis of six trials found it reduced swelling and pain a week after wisdom-tooth surgery, and it may help sinus inflammation as an add-on. Evidence for arthritis is insufficient. People allergic to pineapple should avoid it.

9. Boswellia

Boswellia resin comes from the same family of trees that produces frankincense and has a long history in Ayurvedic medicine for joint problems. Small trials have reported benefits for knee osteoarthritis, but they vary in quality and in the extracts used, so results are not yet settled.

10. Gamma-linolenic acid (GLA)

GLA is a fatty acid found in evening primrose, borage and blackcurrant seed oils. Small, older studies suggested it might ease diabetic nerve pain and rheumatoid arthritis symptoms, but the evidence is limited. Omega-3 fats from fish have stronger support: a 2018 analysis of 20 trials found a modest benefit for rheumatoid arthritis symptoms.

11. Tart cherries

Cherries are rich in anthocyanins, the pigments that make them red, which show anti-inflammatory activity in laboratory tests. Small studies of tart cherry juice for exercise soreness and gout have reported mixed results. The popular claim that cherries contain more anti-inflammatory compounds than any other food is not established.

12. Aquamin (red seaweed)

Aquamin is a calcium- and magnesium-rich supplement made from red seaweed. A small 2008 trial of 70 people with knee osteoarthritis, published in Nutrition Journal, reported less pain and stiffness than placebo after a month. One small trial is a start, not proof.

13. Arnica

Arnica is a European mountain flower used in rubs and gels for bruises and sore muscles. One study found a 50% arnica gel worked about as well as ibuprofen gel for hand osteoarthritis, but a 2014 review found gels of 10% or less ineffective for pain, swelling and bruising. Homeopathic arnica is so diluted it contains none of the plant and has not beaten placebo. Never take arnica by mouth or put it on broken skin: it contains the toxin helenalin, and the US FDA classes it as unsafe to swallow.

Remedies that need correcting or caution

14. Wintergreen oil

Oil of wintergreen is mostly methyl salicylate, and it is used in small amounts in rubs for sore muscles. It is also one of the most dangerous products in a home medicine cabinet. A single teaspoon holds about as much salicylate as 22 adult aspirin tablets, and swallowing it has caused severe poisoning and death, especially in small children. Some of it is also absorbed through the skin, so large amounts on the body can cause poisoning too. Store it out of reach and never swallow it.

15. Birch leaf and bark (Betula)

Sweet birch (Betula lenta) was traditionally distilled for methyl salicylate, the same compound found in wintergreen, which explains its old reputation for easing aches. Claims that birch leaves act like cortisone are mistaken: cortisone is a steroid hormone, and salicylates work in a completely different way. Birch products bring the same salicylate cautions as wintergreen and willow.

16. Cranberry

Cranberry is often promoted as a way to “kill” the bacteria behind ulcers and urinary infections instead of using antibiotics. That is wrong and could be harmful. NCCIH says cranberry products may lower the risk of repeat urinary infections in some women, but they are not a treatment for an infection you already have. Stomach ulcers caused by Helicobacter pylori, the bacterium whose discovery earned Barry Marshall and Robin Warren the 2005 Nobel Prize, are treated with a prescribed combination of an acid-reducing drug and antibiotics. If you take warfarin, ask your doctor before using cranberry regularly.

Using plant remedies sensibly

Tell your doctor or pharmacist. Willow bark, devil’s claw, omega-3s and others can interact with blood thinners, blood-pressure and diabetes medicines.
Do not double up on salicylates. Willow bark, wintergreen and birch products add to any aspirin you already take.
Prefer topical forms where they exist. Capsaicin, peppermint and arnica rubs act locally, but still avoid eyes and broken skin.
Give it a fair, limited trial. If a remedy has not helped after a few weeks, it probably will not.
Get new or severe pain checked. Pain is a signal; a sudden change, swelling, fever or numbness needs medical attention, not a herbal experiment.

Plants gave the world aspirin, morphine and capsaicin patches, so there is nothing fringe about taking them seriously. Doing so properly means asking the same questions as for any drug: does it work, for whom, at what dose, and with what risks.

Sources: NCCIH: Nutritional approaches for musculoskeletal pain and inflammation; NCCIH: Peppermint oil; NCCIH: Cranberry; ACEP Now: Oil of wintergreen toxicity; Wikipedia: Capsaicin; Wikipedia: Arnica montana; Wikipedia: Helicobacter pylori. Based on a list first published by Christina Sarich at Natural Society (2014). Header photo: Pixabay.

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