Kenra Professional Dandruff Shampoo. It has 1.9% zinc - most dandruff shampoos only have 1%. Prescription is 2%.
Matrix Biolage ScalpSync Anti-dandruff Shampoo. It's an anti-bacterial, calming and weightless, plus it gives hair great body.
Tigi BedHead Reboot Shampoo. It rebalances the pH of the scalp to help it retain moisture plus has bacteria fighting properties.