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  2. p-Phenylenediamine - Wikipedia

    en.wikipedia.org/wiki/P-Phenylenediamine

    p-Phenylenediamine (PPD) is an organic compound with the formula C 6 H 4 (NH 2) 2. This derivative of aniline is a white solid, but samples can darken due to air oxidation. [1] It is mainly used as a component of engineering polymers and composites like kevlar. It is also an ingredient in hair dyes and is occasionally used as a substitute for ...

  3. Millions Of People Take Biotin For Hair Growth, And ... - AOL

    www.aol.com/millions-people-biotin-hair-growth...

    Changes in hair: You may start to notice thinning, hair loss, brittleness, or dryness. Changes in skin : This often looks like noticeable dryness, flaky, or scaly skin, especially around the eyes ...

  4. 12 Best Vitamins for Hair Growth - AOL

    www.aol.com/12-best-vitamins-hair-growth...

    3. Folic Acid. Folic acid is a synthetic form of folate, a B vitamin found naturally in many foods. If you eat lots of dark leafy greens (like broccoli, spinach and asparagus), beans, nuts, seeds ...

  5. The best hair growth products for women in 2025, tried ... - AOL

    www.aol.com/lifestyle/best-hair-growth-products...

    In a clinical trial, women taking Nutrafol supplements had longer, thicker hair after six months and improvements in overall hair growth, volume and color. Many of the participants reported ...

  6. m-Phenylenediamine - Wikipedia

    en.wikipedia.org/wiki/M-Phenylenediamine

    m-Phenylenediamine, also called 1,3-diaminobenzene, is an organic compound with the formula C 6 H 4 (NH 2) 2. It is an isomer of o -phenylenediamine and p -phenylenediamine . This aromatic diamine is a colourless solid that appears as needles, but turns red or purple on exposure to air due to formation of oxidation products. [ 3 ]

  7. Uncombable hair syndrome - Wikipedia

    en.wikipedia.org/wiki/Uncombable_hair_syndrome

    Uncombable hair syndrome (UHS) is a rare structural anomaly of the hair with a variable degree of effect. It is characterized by hair that is silvery, dry, frizzy, wiry, and impossible to comb. [4] It was first reported in the early 20th century. [5] It typically becomes apparent between the ages of 3 months and 12 years. [6]