Modius shouldn’t cause headaches and the vast majority of users don’t experience any side effects with using the headset.

We recommend using Modius at a low power level at the start (no higher than level 2 or 3) as it may take time for your body to get used to the stimulation (some people are more sensitive to this than others) and only working up through the power levels over time as your body gets used to it. It’s important to ensure you keep yourself well hydrated too, as many people notice an increase in thirst when they start using Modius.

If you do experience a headache, we would recommend you discontinue use until this has subsided and only recommence at a low level as you feel comfortable.
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