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I haven't heard of a vitamin C shower head, but I have one with a filter media called chlorgon that reduces chlorine. You can buy it at Home Depot:
Sprite Shower Filter
The only thing that can completely remove fluoride is reverse osmosis or distillation. Some filter media can help reduce levels (like alumina) but I think many of the claims online are not legitimate.
Type of Myotonia: Thomsen's