Question: what is the best shampoo for red dyed hair?
Answer: Joico Color Infuse Red Shampoo. ... 
John Frieda Radiant Red Red Boosting Shampoo. ... 
Pureology Reviving Red Shamp'Oil – Best Sulfate-Free Shampoo For Red-Dyed Hair. ... 
Zotos Quantum Riveting Reds Color-Replenishing Shampoo – Best Daily Shampoo For Red Color-Treated Hair.