Shoppers Noticed ‘Less Hair Falling’ Within a Week of Using This $15 Biotin Serum That’s on Sale For Prime Day The Citizen 2 years ago “Hairline has never looked thicker.” Source: Stylecaster.com Share this: Click to share on X (Opens in new window) X Click to share on Facebook (Opens in new window) Facebook Click to share on LinkedIn (Opens in new window) LinkedIn Click to share on Pinterest (Opens in new window) Pinterest Click to share on WhatsApp (Opens in new window) WhatsApp