Hibiscus: Effects, Application and Quality

Hibiscus: A Botanical Wonder

Hibiscus sabdariffa, also known as roselle or karkadeh, belongs to the mallow family (Malvaceae), which also includes cotton and marshmallow. Originally native to West Africa, this annual or perennial herbaceous plant now thrives in tropical and subtropical regions around the globe. What we appreciate in our teas and extracts are primarily the calyces – those fleshy, vibrant red bracts that enclose the plant's fruit.

The cultivation and harvesting of hibiscus calyces is a careful process. The plant prefers warm climates with well-drained soil and abundant sunshine. The calyces are harvested when fully developed, plump, and deep red, typically three to four weeks after flowering. They are then dried to preserve their valuable ingredients and color.

Hibiscus's impressive range of effects is due to its rich phytochemical profile. The most important active compounds include:

• Anthocyanins: These water-soluble pigments are responsible for the characteristic red color. Key anthocyanins such as delphinidin-3-sambubioside and cyanidin-3-sambubioside are potent antioxidants.
• Organic Acids: They give hibiscus its sour-tart taste. These include hibiscus acid (unique to hibiscus), citric acid, malic acid, tartaric acid, and ascorbic acid (Vitamin C).
• Flavonoids: Compounds like quercetin and hibiscetin possess antioxidant and anti-inflammatory properties.
• Phenolic Acids: Protocatechuic acid, chlorogenic acid, and caffeic acid also contribute to the health benefits.
• Polysaccharides and Minerals: Complex carbohydrates can have immunomodulatory effects, while minerals such as calcium, magnesium, iron, and potassium increase nutrient density.

A Journey Through Traditional Medicine

The use of *Hibiscus sabdariffa* is deeply rooted in various cultures, especially where the plant is originally native.

African and Middle Eastern Folk Medicine: The Cradle of Hibiscus

In West Africa, Egypt, and Sudan, hibiscus has a long and rich history. There, it is known by names such as "Karkadeh" (Egypt, Sudan) or "Bissap" (Senegal) and is often the national drink. It is traditionally used to quench thirst, lower body temperature in hot climates, and support high blood pressure and liver ailments. It is also used for coughs, fever, and as a general tonic. Its cultural significance is immense; Karkadeh is served warm or cold and is an integral part of festivities like weddings.

Ayurveda and TCM: Complementary Applications

Although *Hibiscus sabdariffa* is not primarily mentioned in classical Ayurvedic texts, hibiscus in general (especially the flower, Jaswand) is known in Ayurveda for its cooling (sheetal virya) and astringent properties. It is used to balance the Pitta Dosha, promote healthy hair growth, and as a mild diuretic. The general properties of the plant align with its use for cooling and detoxification. In Traditional Chinese Medicine (TCM), *H. sabdariffa* is also not a core herb, but other hibiscus species are used. When using *H. sabdariffa*, the cooling properties are often in the foreground to clear heat, promote diuresis, and quench thirst, which is consistent with its sour taste and traditional uses in other cultures.

European Folk Medicine: A Refreshing Newcomer

Hibiscus arrived in Europe later. Here it is mainly known for its pleasant taste and vibrant color in herbal teas. Traditional medicinal use in European folk medicine is less pronounced than in Africa, but its mild diuretic and cooling properties have been adopted, and it is appreciated as a refreshing beverage.

Preparation methods are diverse: most commonly, it is enjoyed as an infusion (tea) from dried calyces, either hot or cold. However, it is also used in jams, jellies, sauces, and as a natural food coloring.

Scientific Findings: What Research Says

Modern science has begun to explore the traditional uses of hibiscus and has confirmed numerous positive effects. Particularly in the area of cardiovascular health, there is a growing number of studies.

Blood Pressure Lowering Effect: A Solid Evidence Base

One of the best-studied effects of hibiscus is its ability to lower blood pressure. Several clinical studies and meta-analyses have confirmed this effect.

These results are supported by comprehensive review studies:

Positive Effects on Cholesterol and Lipid Levels

In addition to blood pressure regulation, hibiscus also shows promising effects on cholesterol levels.

Further Promising Research Results (Preclinical)

In vitro and animal studies suggest a range of other potential benefits, which, however, still need to be substantiated by further human studies:

• Antioxidant and anti-inflammatory: The anthocyanins and phenolic acids of hibiscus show strong antioxidant activity and can modulate inflammatory responses.
• Hepatoprotective (liver-protective): Animal studies suggest that hibiscus extracts can protect the liver from toxic damage, reduce fatty liver, and improve liver enzyme levels.
• Nephroprotective (kidney-protective): There is evidence of protective effects on kidney function, especially under conditions such as diabetes and high blood pressure.
• Antidiabetic: Animal studies show that hibiscus can improve insulin sensitivity, lower blood sugar levels, and protect pancreatic beta cells.
• Anti-obesity: In vitro and animal studies suggest that hibiscus may inhibit adipogenesis and promote fat breakdown.

Quality of Evidence: An Overview

• Strong: For blood pressure reduction in pre-hypertensive and mildly hypertensive individuals. Supported by several well-designed clinical trials and meta-analyses.
• Moderate: For improving lipid profile (lowering total cholesterol, LDL-C, triglycerides, and increasing HDL-C). Supported by several clinical trials and meta-analyses, although some studies show less consistent effects.
• Preliminary: For antioxidant, anti-inflammatory, hepatoprotective, nephroprotective, antidiabetic, and weight-regulating effects. Primarily supported by in vitro and animal studies as well as early human studies.

EFSA and EU Regulatory Status

For a German wellness brand like DinVeda, regulatory status is crucial. It is important to note that the European Food Safety Authority (EFSA) has not yet approved any specific health claims for *Hibiscus sabdariffa* under Regulation (EC) No 1924/2006. Many proposed claims regarding cardiovascular health or antioxidant effects have either been put on hold or rejected due to EFSA's strict scientific criteria, as the evidence for a clear cause-and-effect relationship was deemed insufficient. This is common for many traditional botanicals.

*Hibiscus sabdariffa* is not considered a novel food in the EU. It has a history of safe consumption prior to May 1997, meaning it can be placed on the market as a food ingredient or food supplement without separate novel food authorization. The German Federal Institute for Risk Assessment (BfR) generally considers hibiscus flowers safe for use in food and food supplements at usual consumption levels.

Hibiscus in Your Daily Life: Application & Enjoyment

Hibiscus can be wonderfully integrated into your daily diet. The most common form is tea, but it also unfolds its full potential and unique taste in other preparations.

Typical Dosages for Hibiscus

The recommended dosage depends on the form of intake. Here are common amounts observed in studies and traditional use:

Refreshing Hibiscus Recipes for Home

Let these simple recipe ideas inspire you to incorporate hibiscus into your daily life in a versatile way:

Important Notes on Application

Frequently Asked Questions about Hibiscus