Shampoos with zinc refer to a category of hair care products that contain zinc pyrithione or similar compounds. Zinc is an essential mineral that has anti-fungal, anti-seborrhoeic (dandruff-causing), anti-bacterial, and anti-microbial properties, making it a popular choice in shampoos for maintaining healthy hair and scalp.
History of Zinc in Skincare
Zinc, being an abundant element on Earth, has a long history of applications in various industries. Its first recorded use in skincare can be traced back to ancient civilizations where it was utilized as a natural remedy for wounds, skin disorders, and infectious diseases. Despite its frequent use, the precise mechanism by which zinc exerts its effects on the skin remained a mystery until recently.
Mechanism of Action
The exact mode of action of zinc on the skin involves complex interactions at the molecular level. It is believed that zinc interferes with the nutritional processes of malassezia yeast, a yeast that is commonly associated with dandruff and seborrheic dermatitis, also known as dandruff.
Anti-dandruff properties
Zinc pyrithione is one of the most widely used derivatives of zinc, and it forms the active ingredient in many anti-dandruff shampoos. The anti-dandruff properties of zinc pyrithione are thought to arise from its ability to bind to the cell wall of the yeast, altering its permeability, and affecting its ability to multiply.
Antiseborrhoeic properties
In addition to its anti-dandruff activities, zinc pyrithione also has anti-seborrhoeic properties. It is also known to improve skin hydration, which can help relieve the dry and scaling associated with seborrheic dermatitis.
Cognitive impacts
There have been several studies exploring the cognitive effects of zinc deficiency in humans. In one study, zinc-deficient rodents displayed impairments in learning and memory. More recent research suggests that even mild zinc deficiencies in older adults are associated with cognitive decline and increased risk of developing Alzheimer’s disease.
Side effects
Zinc/pyrithione shampoos are generally well-tolerated, but not all users may experience positive benefits. Some people may experience skin irritation, particularly if they have sensitive skin or allergies to zinc or related compounds. Additionally, excessive use of zinc pyrithione洗发水 may lead to a drying of the skin and hair.
Dosing recommendations
The recommended concentration of zinc pyrithione in shampoo varies depending on the product and the intended use. In most over-the-counter shampoos, it is present at a concentration of 2% or less. It is important to follow product labels carefully and avoid using zinc supplements without consulting with a healthcare provider.
Ingredients in shampoos
Some of the other ingredients that may be present in shampoos containing zinc include: sulfates, parabens, fragrances, colorants, and other vitamins and minerals that may help improve the condition of the skin. The inclusion of these additional ingredients will vary depending on the specific brand and product formula.
In conclusion
Shampoos with zinc are a popular choice among consumers seeking to manage dandruff and seborrheic dermatitis.锌是一种多功能的成分，可以在不刺激皮肤的情况下提供舒缓的症状和改善头皮状况.
