Question: what is the best shampoo to strengthen hair?
Answer:  Nioxin System 1 Cleanser Shampoo. ... 
 Art Naturals Organic Argan Oil Hair Loss Shampoo. ... 
 Laritelle Organic Shampoo. ... 
 Shea Moisture Sheamoisture Jamaican Black Castor Oil Strengthen & Restore Shampoo, 16.3 Oz. ... 
 Strong HairPro Hair Care Products (SHP Conditioner)