"Skin contact with the plant can cause dermatitis in some people[76]"

"The scarlet pimpernel was at one time highly regarded as a medicinal herb, especially in the treatment of epilepsy and mental problems[254], but there is little evidence to support its efficacy and it is no longer recommended for internal use because it contains toxic saponins and cytotoxic cucurbitacins[238, 254]. The whole herb is antitussive, cholagogue, diaphoretic, diuretic, expectorant, nervine, purgative, stimulant and vulnerary[4, 7, 9, 21, 46]. It can be taken internally or applied externally as a poultice[7]. An infusion is used in the treatment of dropsy, skin infections and disorders of the liver and gall bladder[9, 272]. The plant is best harvested in June and can be dried for later use[4]. Use with caution[21], large doses can cause polyuria and tremor[7]. A homeopathic remedy is made from the plant[9]. It is used internally to treat itchy skins and externally to remove warts[9]"

"The seeds are slightly poisonous to some mammals, but no cases involving people are known[13, 76]"

"The tender shoots are cooked as a vegetable[272]"

"Leaves - raw or cooked[2, 105, 115]. Used in salads[4] and as a spinach[2]. It is best not to eat these leaves[55, 238], see the notes above on toxicity."