Retinal: Vitamin A, Vision and Skincare
Retinal is an active form of vitamin A that plays a key role in the visual cycle of the retina. It is also widely used as an effective active ingredient in skincare.
Wissenswertes über "Retinal"
Retinal is an active form of vitamin A that plays a key role in the visual cycle of the retina. It is also widely used as an effective active ingredient in skincare.
What is Retinal?
Retinal (also known as retinaldehyde) is a biologically active form of vitamin A. It is a fat-soluble molecule produced in the body from beta-carotene or retinol. Retinal serves two major functions: it is an essential component of the visual cycle in the retina, and it is used as an active ingredient in dermatology and skincare.
Biological Function
In the eye, retinal binds to the protein opsin to form the light receptor rhodopsin, which is responsible for vision in low-light conditions. When light hits the retina, retinal undergoes a structural change (from 11-cis-retinal to all-trans-retinal), triggering a nerve signal that the brain processes as a visual image.
- 11-cis-retinal: active form in the dark-adapted eye
- all-trans-retinal: formed after light absorption
Retinal as a Skincare Ingredient
In cosmetics and dermatology, retinal is increasingly used as an alternative to retinol and tretinoin. It belongs to the group of retinoids and acts more directly, as it requires only a single conversion step to retinoic acid (the ultimately active compound), whereas retinol requires two steps.
Benefits of Retinal in Skincare
- Stimulation of collagen production
- Promotion of cell renewal
- Reduction of fine lines and wrinkles
- Improvement of skin texture and tone
- Minimising pore appearance and regulating sebum production
Tolerability
Compared to tretinoin, retinal is generally better tolerated by the skin. However, especially at the beginning of use, redness, dryness, or mild irritation may occur. Experts recommend applying retinal in the evening and combining it with a sunscreen during the day.
Application and Dosage
Retinal is available in concentrations ranging from 0.05% to 0.1% in cosmetic products. A gradual introduction is recommended, starting with two to three applications per week before moving toward daily use.
Deficiency and Health Consequences
A deficiency in vitamin A and therefore retinal can lead to night blindness, dry eyes, and in severe cases, irreversible vision loss. In developing countries, vitamin A deficiency is one of the most common causes of preventable blindness in children.
Safety and Interactions
Excessive intake of preformed vitamin A (which includes retinal) can be toxic, causing symptoms such as headaches, nausea, and liver damage. Pregnant individuals should consult a healthcare provider before taking high-dose vitamin A supplements or using highly concentrated retinoids on the skin.
References
- World Health Organization (WHO): Vitamin A deficiency. Available at: https://www.who.int/data/nutrition/nlis/info/vitamin-a-deficiency
- Mukherjee S. et al. - Retinoids in the treatment of skin aging: an overview of clinical efficacy and safety. Clinical Interventions in Aging, 2006; 1(4): 327-348.
- Alberts B. et al. - Molecular Biology of the Cell. 6th edition. Garland Science, 2014.
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Related search terms: Retinal + Retinaldehyde + Vitamin A Aldehyde