Dandruff Shampoo & Conditioner formulation without Zin Pyrithione.

I am a manufacturer here in Vancouver, Canada. We have bene making a Dandruff Shampoo with 1% Zinc Pyrithione. Nowe not allowed to use thsi zinc as we a natural based line. 

Now we need to decide what to put in its place. If we leave the zinc out the formulation does not have the same loom and feel and nor might it have the same efficacy!!

Any feedback. 
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