Is infrared sauna safe is usually asked about two different things at once: whether the heat itself is a risk, and whether the electromagnetic fields from the panels are. They deserve separate answers, because the first is well understood and the second is mostly a marketing argument between manufacturers.
The heat
An infrared cabin runs much cooler than a traditional sauna, so the heat load is lower for a comparable session. The ordinary cautions still apply: hydrate, do not use one after drinking, do not stay past the point it stops being pleasant, and do not use one alone while you are still learning your tolerance. Heat stress is the real risk, and it is manageable.
The EMF question
Panels carry current and therefore produce electromagnetic fields, as every appliance does. Makers compete on low EMF claims, and the honest position is that there is no established evidence of harm from the levels involved, and no agreed standard for what low means in this context. Treat a measurement with the test conditions stated as meaningful and an adjective as marketing.
Who should ask first
Anyone pregnant, with a cardiovascular condition, with low or poorly controlled blood pressure, with a condition affecting temperature regulation, or taking medication that affects either. Also anyone with an implanted device, who should ask the device manufacturer rather than a sauna retailer. This is a clinician's question and we do not answer it here.
The practical safety items
Look for a cabin listed by a recognized testing laboratory, a control that shuts off on a timer, panels guarded so you cannot rest against them, and a door that opens outward with no lock. Those four are worth more than any claim on the specification sheet, and the last one matters most if anyone uses the cabin alone.
Questions people ask about is infrared sauna safe
Is infrared sauna EMF dangerous?
There is no established evidence of harm at the levels involved, and no agreed standard for low EMF. Prefer makers who publish a measurement with test conditions over ones using the phrase as a slogan.
Is infrared safer than a traditional sauna?
It runs cooler, so the heat load is lower. That is not the same as safer overall, and the cautions about hydration and existing conditions are identical.
Can you use one every day?
Many owners do, at moderate durations. If you have any cardiovascular condition or are pregnant, ask a clinician rather than a retailer.