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The hair dye formulations tested did not cause long-term toxicity or cancer in mice.

Different species and human skin models vary in their skin enzyme activities, with pig skin and some models closely matching human skin, useful for safety assessments and understanding the skin's protective roles.

Coloring shampoos for gray hair may cause gene mutation, reproductive issues, and skin damage, needing stricter regulation and expert consultation.

m-Aminophenol in hair dye can cause skin cell toxicity and stress responses.

Dermatologists need to understand hair products to treat hair and scalp issues better.

Permanent hair dyes use chemicals that react with hydrogen peroxide to create color.

Permanent hair dye mixtures can irritate and damage the skin.

Nanomaterials can improve hair care products and treatments, including hair loss and alopecia, by enhancing stability and safety, and allowing controlled release of compounds, but their safety in cosmetics needs more understanding.

Black henna tattoos can cause severe allergies to hair and textile dyes, and there's a need for greater public awareness and regulation.

Hair product allergies are common, especially to hair dyes, and hairdressers are at higher risk.

Hair dyes can change hair color temporarily or permanently but may cause side effects like skin reactions and hair damage.

Cosmetics and procedures can cause eye issues, from mild discomfort to serious conditions, due to allergies, toxins, or poor care.

Hair dyes and perms can damage hair and scalp, but using interventions can reduce harm.

The article concludes that advancements in hair cosmetics require dermatologists to stay informed about products and their potential risks, including allergies and higher risks for hairdressers.

Using A132 hair dye with sunlight can cause skin damage and hair loss.

Avoid chemical and physical damage to protect hair.

Natural plant-based substances can be used as effective hair dyes.

Many people had severe allergic reactions to a common hair dye ingredient, causing them to seek medical care and miss work.

The MXD/24HA salt is more effective for hair growth than raw MXD.

Women with excessive hair growth tend to have shorter index and ring fingers compared to others.

New compounds were made that block an enzyme linked to breast cancer better than existing treatments.

ALA-photodynamic therapy helps reduce acne by causing acne cell death and lowering certain skin protein levels.

Neurotrophin-4 increases calcium current in specific mouse neurons through the PI3K pathway.

The compound (1R,2S)-4-(2-Cyano-cyclohexyl-oxy)-2-trifluoromethyl-benzonitrile can stimulate hair growth and reduce oil production when applied topically.

Scientists made a chemical (compound 4e) that can be applied on skin to reduce oil production, which can help with acne, but it might cause skin sensitivity to light.

The new compound is a promising, less toxic alternative to finasteride for treating prostate issues.

A new compound shows promise as a topical treatment for hair loss.

Removing Sprouty genes in mice causes various hormone-related issues but does not increase cancer risk by one year of age.

Analog 23 is a promising compound for prostate cancer treatment.