Nothing but pure spearmint leaves. It's the base for Moroccan Mint tea and can be added to almost any other tea if you like a spearminty taste.
If you're old enough you'll remember Spearmint Leaf sweets, the taste is the same.
A quick Wikipedia search shows that spearmint tea is used to treat hirsuitism in women as it reduces the level of free testosterone in the blood
Pure dried spearmint
1 heaped teaspoon for 200ml cup
Add freshly boiled water
Steep for 6 - 10 minutes then pour
Moroccan mint tea
50 gram bag will make around 35 cups of tea