Overview

• Outlets reiterate that graying stems from age‑related melanin loss and cite Harvard research tying stress hormones to pigment‑cell depletion.
• Recent reports highlight vitamin B12 deficiency as a risk for premature grays, noting higher prevalence in severe B12‑deficiency anemia and pointing to animal‑based foods or supplements as common sources.
• Guides promote home methods such as an avocado‑seed and cinnamon boil and a three‑day tea, sage, and rosemary rinse that is claimed to restore color, though results can vary and are often temporary.
• A budget SGACAI tinting shampoo sold at Walmart is advertised to cover grays in minutes with black and brown shades and plant‑extract ingredients at a low price.
• Safety notes reference National Cancer Institute summaries on certain hair‑dye chemicals tested as carcinogenic in animals, with recommendations to patch test and consult a dermatologist when needed.