Essential sauna add-ons
The trifecta of my sauna experience (clockwise from left): Birch switch, beer (German) and tar (essential oil). Birching is self explanatory (check out the non-punitive uses), beer is for drinking. Tar has many uses, but I mix it with the water I am throwing into the sauna stove (and enjoy the subsequent fumes).
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Sauna fragrance accessories such as essential oils come in concentrated, hydrophobic liquid containing aroma compounds which come from plants. Aromatic herbs, spices, and fragrant flowers are the first thing you may think of - such as sage, birch, spearmint, and peppermint - but they also include concentrated extracts of various fruits, leaves, roots and woods. The essential oils are up to 100 times more concentrated in these essence molecules than in the dried plant. Try it in your home sauna.