Dermaharmony2% Pyrithione Zinc Shampoo Bar with Shea Butter by Grace of Me (4 Oz) (Lavender)

How is this shampoo bar different from the other dermahaony pyrithione shampoo bar? Does it oily scalps better?

Are these syndet bars? I am looking for a syndet dandruff shampoo bar because we want to cut back on our plastic use but have very hard water.

How many times a week do you wash your hair with this soap bar?

Do all grace shampoo bars have 2% pyrithicone zinc? i am not a peppermint or tea tree fan but i do need the zinc.