Young Brunette Girl Strips Her Dress Near Mountain-ash Shrubs With Red Berries

Rowan fruit contains sorbic acid, an acid that takes its name from the Latin name of the genus Sorbus. The raw fruit also contain parasorbic acid (about 0.4%-0.7% in the European rowan), which causes indigestion and can lead to kidney damage, but heat treatment (cooking, heat-drying etc.) and, to a lesser extent, freezing, neutralises it, by changing it to the benign sorbic acid. Luckily, they are also usually too astringent to be palatable when raw. Collecting them after first frost (or putting in the freezer) cuts down on the bitter taste as well.
• Mythology and folklore
The European rowan (S. aucuparia) has a long tradition in European mythology and folklore. It was thought to be a magical tree and protection against malevolent beings. In Celtic mythology the rowan is called the Traveller's Tree because it prevents those on a journey from getting lost. It was said in England that this was the tree on which the Devil hanged his mother. In Norse mythology the rowan was associated with the goddess Sif.
The density of the rowan wood makes it very usable for walking sticks and magician's staves. This is why druid staffs, for example, have traditionally been made out of rowan wood, and its branches were often used in dowsing rods and magic wands. Rowan was carried on vessels to avoid storms, kept in houses to guard against lightning, and even planted on graves to keep the deceased from haunting. It was also used to protect one from witches. Often birds' droppings contain rowan seeds, and if such droppings land in a fork or hole where old leaves have accumulated on a larger tree, such as an oak or a maple, they may result in a rowan growing as an epiphyte on the larger tree. Such a rowan is called a "flying rowan" and was thought of as especially potent against witches and their magic, and as a counter-charm against sorcery. Rowan's alleged protection against enchantment made it perfect to be used in making rune staves (Murray, p. 26), for metal divining, and to protect cattle from harm by attaching sprigs to their sheds. Leaves and fruit were added to divination incense for better scrying.