What is Sorrel?

Sorrel is the Caribbean name for the dried red calyces of Hibiscus sabdariffa, the cup-shaped husks around the seed pod. Steeped in hot water, they make a tart, ruby-red drink. It is a Christmas staple in Jamaica, Trinidad, Guyana and Haiti.

The same plant is called roselle in English and oseille in Haitian Creole. Do not confuse it with garden sorrel (Rumex acetosa), a leafy green sold for salads. That plant is high in oxalic acid and carries different risks.

Beyond the kitchen, sorrel is sold as tea bags and capsules, mostly for blood pressure. Human trials do show a small drop in blood pressure, so this is one of the better-studied folk drinks. Long use in a tradition is not proof that a remedy works, and it is not proof that it is safe.

How does Sorrel work?

The best-supported effect is a small drop in blood pressure, measured in human trials. How sorrel does that is still not settled.

In animal and test-tube studies, hibiscus extracts appear to relax blood vessels. They also seem to slow ACE, an enzyme that makes vessels tighten. That is the same target as some blood pressure drugs.

In animals, sorrel acts as a mild diuretic, meaning it makes the body pass more urine. Losing some salt and water may add to the blood pressure effect. This has not been pinned down in people.

The red pigments are strong antioxidants in test tubes. Antioxidants mop up unstable molecules that can damage cells. Whether that matters once you drink the tea is not established.

Small trials have also looked at blood fats and blood sugar. Results are mixed and the changes are modest. Lab and animal findings should not be read as proven effects in people.

What forms does Sorrel come in?

Most people meet sorrel as a drink made from the dried calyces.

Common forms:

- Dried calyces, loose or in tea bags - Fresh calyces, sold around Christmas - Bottled or canned sorrel drink

- Powders and capsule extracts - Syrups, jams and jellies - Sorrel wine and rum-spiked punch

Home drinks are usually brewed with ginger and cloves, then sweetened. A single sweet glass can carry as much sugar as a soft drink. That matters if you have diabetes (high blood sugar) or are watching your weight.

Capsules are far more concentrated than a cup of tea. Most of the safety questions on this page apply to those stronger products. Food amounts and medicine-strength extracts are not the same thing.

Where it comes from:

Sorrel came to the Caribbean with enslaved West Africans, and the drink became tied to Christmas. The plant is grown widely across Africa, Asia and the Caribbean.

Caribbean folk healers served the steeped calyces as a cooling drink in hot weather. It was given for fever, colds and what many called high blood. Elders also used it as a mild remedy for a sluggish gut.

The same plant is drunk as karkade in Sudan and Egypt, often iced. In parts of West Africa it is brewed as bissap. None of this history tells you that the drink is right for your own health problem.

What does Sorrel help with?

• Mildly raised blood pressure: This is the use with the most human evidence. Several small trials and pooled reviews show a drop of roughly 5 to 8 points in the top blood pressure number. The trials were short and mostly small, so the finding is promising rather than firm. Sorrel is not a replacement for blood pressure medicine.
• Raised blood fats: Tradition did not claim this; it comes from modern lab work. A few small trials report minor falls in total cholesterol or rises in HDL, the good cholesterol. Other trials found no change. The evidence is too mixed to rely on.
• Everyday rehydration and a cooling drink: Caribbean households served chilled sorrel in heat and after hard work. As a fluid it does what any tart, chilled drink does. Sweetened versions add a lot of sugar.
• Colds and fever (traditional use): Healers brewed sorrel hot with ginger for chills and head colds. There is no human trial showing it shortens a cold. A warm drink can ease a sore throat, which may be most of what people notice.
• Sluggish digestion (traditional use): The calyces hold pectin and mucilage, soft plant fibres. In animals these fibres soften stool. No good human study backs sorrel as a laxative.
• Weight and blood sugar support: Some small trials of hibiscus extract report slight falls in weight or waist size. The changes were small and the studies short. A sugar-sweetened sorrel drink works against this goal.

Which foods are rich in Sorrel?

1. Sorrel drink made from dried calyces
2. Karkade or bissap hibiscus tea
3. Sorrel jam, jelly and syrup
4. Hibiscus blends in fruit and herbal teas

Practical Tips:

Sorrel is a food first and a remedy second. Many bottled drinks and jams are heavily sweetened. Check the sugar on the label if you are managing diabetes or weight.

What are the side effects of Sorrel?

• Stomach ache, wind or loose stools
• Passing more urine than usual
• Feeling dizzy or light-headed if blood pressure drops
• Tooth sensitivity from the acid over time
• Headache in some users
• Large sugar load from sweetened drinks
• Rare allergic reaction: rash, itching, swelling
• Changes in liver blood tests, reported with very high extract doses

Good to know:

As a drink in normal amounts, sorrel is well tolerated by most people. The usual complaints are a sour stomach and extra trips to the toilet.

The more serious concerns sit with concentrated extracts, not with a cup of tea. Dizziness points to blood pressure dropping too far. Stop and get advice if that happens.

How much Sorrel should you take?

• Recommended daily: This page gives label ranges, not advice for you. Tea products often list about 1.5 to 3 grams of dried calyces per cup. Capsule labels commonly sit in the 250 to 500 mg range of extract per dose. Trials that found blood pressure effects usually used one to three cups of strong tea a day. Home-brewed sorrel is far more variable. If you take medicine for blood pressure or diabetes, ask your doctor before using any concentrated product.
• Best time of day: Timing does not seem to matter much. Some people find the mild diuretic effect, meaning more trips to the toilet, less annoying earlier in the day. Keep it away from the exact time you take other tablets.
• With or without food: Either is fine. The drink is acidic, so taking it with food may be easier on a sensitive stomach. Rinsing your mouth with water afterwards helps protect tooth enamel.
• Time to effect: In blood pressure trials, changes showed up after two to six weeks of daily use. Nothing happens in a single cup. It may do nothing at all for you, and no amount of tradition guarantees an effect.
• How long to take it: Most trials ran for two to six weeks. There is no good data on taking strong hibiscus extracts for many months or years. As a seasonal or everyday drink it has a long record of food use. If you are using it for a health reason and see no change after about six weeks, there is little point in carrying on.