很久以前，在苗栗客家庄內，有一位胡阿婆能識百草，一日她發現阿嫂痛苦的坐在門口，就上前關心，發現阿嫂身上長了很多俗稱攔腰蛇的皰疹，就帶她走進菜園內採摘一把羊耳草，並交代洗淨後用飯碗放酒八分以火慢燉，內服外擦數日，幾天後，阿嫂豁然痊癒，此方因此流傳下來並助人無數；億達草本傳承胡阿婆的愛心，持續培育繁殖，並研發出山中傳奇抹草美容皂--桐花系列，期待更多人受惠。
　　億達草本研發工作室針對現代人，面對各種壓力、身心疲累、不安定，乃採集客家祖先傳統淨身、趨吉辟邪的--抹草、香茅及芙蓉等天然芳香草本，和獨家配方羊耳草的濃縮精華，提供您淨化身心的天然草本美容皂，自然蔭乾，不添加化學硬化劑，內含天然保濕因子，深層清潔，專為滋潤您的肌膚所設計的天然產品。

A long time ago in a Hakka village of Miaoli, there was an old woman and also an herbalist called Mrs. Hu. One day, Mrs. Hu ran into a young woman who was in pain. After she had seen the young woman''''''''''''''''''''''''''''''''s syndromes, Mrs. Hu grabbed some goat-ear grass in her garden for the young woman to take as medicine. In days, the young woman had recovered and so had the formula passed down and helped numerous people.

In the present, Yi Da Herbal carries on Mrs. Hu''''''''''''''''''''''''''''''''s love, proudly presents the Legend of the Mountain Mint Beauty Soap－The Tung Blossom Series. Yi Da Herbal Research Workshop has aimed at solving problems such as all kinds of stress, mental and physical fatigue, unstable of modern people. The workshop has selected natural, aromatic and herbal materials such as mint, lemongrass and cotton rose along with its unique essence of goat-ear grass to make the most natural herbal beauty soap. The soap is cooled and dried naturally with no artificial sclerotic is added. The soap consist natural moist-preserving molecules and it also provides deep cleansing and moistening your skin.