Does FSA cover probiotics?
Probiotics usually aren't FSA-eligible — the IRS treats supplements taken for general digestive or immune health as personal expenses, though probiotics a doctor prescribes for a diagnosed condition can qualify.
What flips the answer
- Covered when
A doctor prescribes the probiotic to treat a diagnosed condition, typically documented with a Letter of Medical Necessity.
- Not covered when
The probiotic is for general digestive or immune health with no diagnosed condition behind it — the common case.
- Not covered when
The LMN isn't filed and substantiated within your FSA plan year, since unused FSA elections don't carry forward indefinitely.
IRS Publication 502 excludes vitamins and supplements taken for general health, and probiotics bought for everyday gut or immune support fall in that category. Because they aren't treating, curing, or mitigating a specific diagnosed condition, FSA and HSA administrators typically deny them.
The exception is condition-specific: when a doctor prescribes a probiotic to treat a diagnosed condition — for example, managing a specific gastrointestinal disorder or recovering gut flora after a course of treatment — it can qualify, usually with a Letter of Medical Necessity documenting the diagnosis and the treatment plan.
Because FSA funds are use-it-or-lose-it within the plan year, any LMN paperwork for a probiotic needs to be filed and substantiated before your plan year's deadline; there's no rolling balance to fall back on the way there is with an HSA.
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