$20 OFF Follicle Activator Hair Serum promotion is available March 25, 2024 12:00 am PST - May 31, 2024 11:59 pm PST. Cannot be combined with other discounts. Discount automatically applied at checkout. Follicle Activator Hair Serum and BioGro™ LED Brush must be added to cart in order to be eligible for discount.