Cliganic Organic Eucalyptus Essential Oil, 100% Pure, 1 Fl Oz

Scent is optional in a Finnish sauna – plenty of bathers want nothing but hot wood and water – but a little eucalyptus in the löyly water is one of the most common additions. This Cliganic oil is a single ingredient, certified USDA Organic, and the maker says each batch is tested for purity by an independent lab.

It is sold for diffusers, not saunas, so the listing gives no sauna instructions. The general practice is heavy dilution: a few drops stirred into a full bucket of water, never neat oil on the heater. Essential oils are concentrated and flammable, so the bottle stays outside the hot room and out of reach of children and pets.

Tip: Start with two or three drops in a full bucket and stir before each ladle, because oil floats on water – you can add more next round, but you cannot take it back out of the air.