So I have some lemon balm and peppermint in my garden and we use it to make tea.
I really like the smell and aroma of lemon balm and if I look online, it mentions for example that lemon balm is used for relieving anxiety, stress and can improve cognitive function.
But how is this tested, how can people even tell?
Does it really have this effect? And what would happen if you drink a lot of it?


Yeah, everything depends on the plant and mostly the dose. Both examples you give are apparently safe to use in small amounts as a herb for flavouring food or drinks. (from wikipedia) So I suppose even for those plants with know strong effects, just eating a leaf wont do much.
I won’t supposed so. A single pinch of woodworm make a whole kettel if herbal tea with already medicinal effect. In households, aruda is used for its smell only, as consumption could quickly harm someone.