Mechanism Overview: Copper at the Intersection of Structure and Color Copper is an essential trace element that serves as a cofactor for several enzymes critical to hair biology, most notably lysyl oxidase (required for collagen and elastin cross-linking), tyrosinase (the…
Mechanism Overview: The Follicle’s Internal Cleanup System Autophagy (from the Greek “self-eating”) is a cellular process by which damaged organelles, misfolded proteins, and other cellular debris are degraded and recycled. In the hair follicle, autophagy plays a critical role in…
Mechanism Overview: Concentrating the Body’s Growth Factors Platelet-rich plasma (PRP) is an autologous preparation of concentrated platelets in a small volume of plasma, obtained by centrifuging the patient’s own blood. Platelets are rich in alpha granules that contain over 30…
Mechanism Overview: Building Blocks of Hair Hair is approximately 95% keratin protein, and keratin is composed of amino acids linked by peptide bonds into polypeptide chains. The hair follicle must synthesize approximately 6 meters of keratin protein per day (across…
Mechanism Overview: Melatonin as a Follicle Hormone Melatonin (N-acetyl-5-methoxytryptamine) is best known as the “sleep hormone” produced by the pineal gland in response to darkness, but it has a much broader role as a tissue-protective molecule with potent antioxidant, anti-inflammatory,…
Mechanism Overview: From Gut Microbiome to Hair Follicle The concept of a “gut-skin axis” has gained significant attention in dermatology and trichology, positing that the gut microbiome influences skin and hair health through immune modulation, nutrient absorption, and the production…
Mechanism Overview: BMP as the Brake on Hair Growth Bone morphogenetic proteins (BMPs) are members of the TGF-β superfamily that play a dual role in hair follicle biology: they are needed for follicle development during embryogenesis, but in adult follicles,…
Mechanism Overview: The Molecular Architecture of Hair Hair is composed of approximately 95% keratin—a family of fibrous structural proteins that form the hair shaft’s remarkable combination of strength, flexibility, and chemical resistance. The keratin in hair is “hard” or “alpha-keratin,”…
Mechanism Overview: Selenium and the Selenoprotein Family Selenium is an essential trace element that is incorporated as the amino acid selenocysteine into 25 human selenoproteins—enzymes and proteins that play critical roles in antioxidant defense, thyroid hormone metabolism, and redox signaling.…
Mechanism Overview: Caffeine as a Follicle Stimulant Caffeine (1,3,7-trimethylxanthine) is the most widely consumed psychoactive substance in the world, and its potential effects on hair growth have generated significant scientific and commercial interest. The evidence base began with an influential…
