A rainbow of vitality

What are anthocyanins?

Anthocyanins are natural plant pigments and belong to the group of secondary plant compounds. They are part of the polyphenols and classified among the flavonoids, a class of compounds that also includes substances like quercetin and catechins. They give flowers, leaves and fruits intense red, purple and blue hues up to black.

For the plant, these pigments fulfil important roles: they provide protection against herbivores, act as signals and attractants for pollinating insects and contribute to UV protection. The group of anthocyanins is very diverse and widespread in the plant world.

How much anthocyanin a plant produces is not fixed but depends on numerous factors. Important influences include species and cultivar, developmental stage and environmental factors such as light, temperature, water availability and soil quality. Stressors can also affect the production of these pigments.

What health benefits do anthocyanins offer?

Anthocyanins exert a variety of health-promoting effects in the human body, mainly due to their strong antioxidant and anti-inflammatory activity. They neutralise free radicals, reduce oxidative stress and thus contribute significantly to the prevention of many chronic diseases. This protective mechanism supports general cellular health, strengthens the immune system and helps protect nerve structures from damage.

Several studies also demonstrate positive effects of anthocyanins on the cardiovascular system: they improve vascular function, promote arterial elasticity, can lower blood pressure, reduce harmful LDL cholesterol and simultaneously raise HDL. This can lower the risk of thrombosis, heart attack and stroke.

Another focus is their ability to inhibit inflammatory processes. This is beneficial for conditions that often arise from chronic inflammation, including type 2 diabetes, atherosclerosis, arthritis or certain skin and intestinal disorders. Additionally, studies show that anthocyanins have antibacterial and antiviral properties, potentially protecting against pathogens such as Escherichia coli, Staphylococcus aureus or influenza viruses.

In the context of cancer prevention, their importance is also evident: they can activate genes that protect against cellular mutations while suppressing cancer-promoting gene activity. They also promote differentiation of cancer cells, which can reduce their aggressiveness.

On a cognitive level, anthocyanins contribute to maintenance of memory and good cerebral blood flow. Anti-inflammatory effects in the nervous system, improved protection of neurons and possible reduction of harmful protein deposits underline their potential in the management of neurodegenerative diseases such as Alzheimer’s or Parkinson’s.

Moreover, skin and metabolism also benefit from these plant pigments: they can help counteract photoaging, promote collagen formation and strengthen skin protection. In metabolic terms they support stable blood sugar regulation, improve insulin sensitivity and positively influence the gut microbiome, which in turn supports weight control and overall vitality.

Why do anthocyanins change colour?

Anthocyanins change colour depending on the pH of their environment. Under acidic conditions, such as in lemon juice, they appear red. At neutral pH, as in pure water, they take on a purple hue. In alkaline conditions, for example in contact with soap solution or baking soda, the colour shifts towards blue.

The reason is that the molecular structure of the pigments changes with acidity. A clear example is red cabbage: when cooked with vinegar it becomes redder, while with baking soda it takes on a bluish hue. This effect is also observed in fruit. During ripening, pH drops due to sugar formation, making anthocyanins appear redder. The colour change therefore functions not only as a visual signal but also reflects chemical changes in plant tissue.

Are anthocyanin supplements useful?

Dietary supplements containing anthocyanins can be an additional source of these secondary plant compounds, but from a nutritional point of view they are not strictly necessary. Like other secondary plant compounds, anthocyanins are not essential nutrients, though they influence many metabolic processes.

Since there are currently no concrete intake recommendations for individual secondary plant compounds, a varied, plant-focused diet rich in vegetables, fruit, legumes, nuts and wholegrain products is recommended. This not only increases the intake of anthocyanins but also ensures supply of fibre, vitamins and other valuable plant compounds.

Those who rarely consume anthocyanin-rich foods may choose standardised extracts in the form of capsules, tablets or drink powders. It is important to select products with clear origin information and quality control — ideally from well-researched sources such as blueberries, blackcurrants or purple sweet potatoes. Nevertheless: the combination of natural foods and an overall balanced diet remains the most reliable and comprehensive way to benefit from anthocyanins.

Do anthocyanins have side effects?

At the amounts in which anthocyanins naturally occur in fruit and vegetables, they are considered well tolerated and generally do not cause problems. However, very high doses — especially in supplement form — can, in individual cases, cause unwanted reactions.

These may include gastrointestinal symptoms such as nausea, bloating or diarrhoea, caused by the high concentration of bioactive compounds. Interactions with certain medications, for example anticoagulants or blood pressure drugs, are also possible, since anthocyanins can affect clotting and further lower blood pressure. Rarely, allergic reactions occur, which may manifest as rash, itching, swelling or breathing difficulties.

How to integrate anthocyanins into everyday life: practical tips

• Start the day with a breakfast shake rich in anthocyanins. Use almond, oat, rice or soy milk and combine with blueberries, blackberries, raspberries, acaí, aronia or goji berries and cherries. For a creamy texture add a banana and a little maple syrup for mild sweetness. This provides a concentrated portion of anthocyanins first thing in the morning.
• Drink freshly pressed red cabbage juice. Red cabbage contains particularly high levels of anthocyanins, especially when raw. Press it together with apples for natural sweetness and a little ginger for a slight kick. The juice is not only intensely coloured but also supplies vitamin C and phytonutrients.
• Choose purple vegetables when shopping. Purple cauliflower, purple corn or small purple eggplants contain significantly more anthocyanins than their pale counterparts. For eggplants, be sure to eat the skin, as most pigments are located directly beneath it. Prefer organic produce to avoid pesticide residues.
• Garnish dishes with edible flowers. Flowers such as pansies, mallows, chive blossoms or hardy geraniums are not only attractive but also anthocyanin‑rich. Sprinkle them fresh over salads, desserts or soups to enhance both nutrition and presentation. Use only flowers from controlled cultivation to avoid contaminants.
• Also incorporate black cherries into snacks. These fruits are rich in anthocyanins and vitamin C and contain around three grams of fibre per cup. Enjoy them fresh in summer or, out of season, frozen in muesli, yoghurt or quark.
• Elderberries are extremely rich in anthocyanins but should never be eaten raw as they contain toxic components. Cook the berries for syrups, jellies or warm drinks. They are also useful for supporting the immune system, particularly during cold season.
• Replace white rice with black rice. It can contain up to 456 mg of anthocyanins per 100 g, as well as iron, fibre and minerals. Cook it like regular rice but with a little more water, as its hull is firmer. It pairs well with vegetable dishes, curries or bowls.
• Bake with anthocyanin-rich berries. Use blackcurrants, blueberries or raspberries for muffins, wholegrain cakes or oat crumbles. Although some anthocyanins are destroyed by baking, most remain, especially if baking time is not unnecessarily prolonged.
• Freeze blueberries or blackcurrants in ice cube trays with water or coconut water. These ice cubes add colour and a fruity flavour to mineral water or unsweetened iced tea.
• Regularly eat edible plant parts that contain water‑soluble pigments from the anthocyanin group, such as grapes, to increase the bioavailability of these pigments. Note that their biosynthesis can also be influenced by microorganisms.
• Make fruity berry dressings. For example, purée mulberries or blackcurrants with olive oil, balsamic vinegar and honey for a dressing for green salads. This way you also incorporate anthocyanins into savoury meals.
• Pair berries with meat or game dishes. Aronia berries or black cherries give game stews, duck or poultry a fruity, slightly tart note.

Anthocyanins naturally combine pleasure and health. Those who include them in their diet benefit twice: from their colour and from their valuable constituents.