GUAM UPKER TRIVALENT SHAMPOO GUAM UPKER TRIVALENT SHAMPOO description, why it is used and functions GUAM UPKER TRIVALENT SHAMPOO is a parapharmaceutical product marketed as a shampoo used to protect and promote scalp growth by repairing it from degradation and therefore the formation of dandruff. GUAM UPKER TRIVALENT SHAMPOO is ideal for sanitizing hair, nourishing the sebaceous layer beneath the hair and providing structural strength to the hair. GUAM UPKER TRIVALENT SHAMPOO is ideal for sanitizing hair, nourishing the sebaceous layer beneath the hair and providing structural strength to the hair