According to the owner of the clinic, salt has "anti-sceptic" properties - I can only think she meant antiseptic, unless she really was referring to the ability to overcome sceptical clients' doubts about the efficacy of the treatment.
The article also had a long sidebar on complimentary therapies.

Salt, Mrs M, is anti-sceptic. It is easier to swallow both food and lies if take it with a pinch of salt, hence the phrase. So salt reduces scepticism.
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