To avoid dull looking hair, use a shampoo with an acidic pH, which will seal the hair's cuticle, hence boost shine.

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Cult Essentials
Cult Essentials $111.00 $139.00
Detangling hairbrush
Travel brush - Christophe Robin
damaged hair shampoo
Regenerating mask with rare prickly pear seed oil
Damaged Hair oil
color protection shampoo
color protection
Cleansing mask with lemon