Can I use this in a steam room, or is it only for a sauna?

This fragrance is designed for use in baths, saunas, and steam rooms, as the manufacturer's description states. The principle is the same everywhere: you add a small amount to water, and the heat causes the scent to evaporate and spread through the air. In a traditional sauna, you pour the diluted mixture over the hot stones. In a steam room, the air is already humid, so the scent may feel more diffuse; you might need a slightly smaller amount to achieve the same effect.

For a steam room, you can place a bowl of the diluted mixture near the steam source, or add it to the water used for the steam generator if the equipment allows it. Always follow the safety instructions for your specific sauna or steam room equipment. If you have a home steam unit, check its manual before adding any fragrance to the water reservoir, as some systems are not designed for additives.