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[DOI] [PubMed] [Google Scholar] 102.Kellenberger E, Kuhn I, Schuber F, Muller-Steffner H

In order to qualify to use your HSA or FSA card for a product, the IRS requires you to have a Letter of Medical Necessity

Most of the evidence supporting this claim comes from a few observational studies

[PubMed] Pickart L, et al
