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November 1998 in “Wound Repair and Regeneration” Hair papilla cells can create and regenerate hair bulbs under the right conditions.
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April 1968 in “Development” Excess vitamin A can cause hair follicles to change into gland-like structures.
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August 2003 in “Phytotherapy Research” Ginseng, especially red ginseng, helps hair grow by increasing blood flow and energy to hair roots.
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July 2021 in “The anatomical record” Different whale and dolphin species have unique whisker follicle structures, suggesting they might use their whiskers in various ways.
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November 1998 in “The journal of investigative dermatology/Journal of investigative dermatology” Beard cells, unlike scalp cells, produce growth factors in response to testosterone, which may explain differences in hair growth.