Bath additives - Yokuyozai

Japanese: 浴用剤 - よくようざい

These are non-medicinal products and medicines used when taking a bath. They are also called bath additives. They are not only effective in improving blood circulation, enhancing metabolic functions, and cleansing the skin, but also for moisturizing, keeping warm, relieving stress, and treating skin diseases, stiff shoulders, lower back pain, neuralgia, and rheumatism. Bath additives are generally broadly divided into those that are expected to have the effects of hot spring ingredients and those that are expected to have the effects of medicinal plant ingredients. The former contain inorganic salts such as sodium bicarbonate (baking soda), sodium sulfate (glaberrima), salt, and alum, while the latter contain ingredients such as touki (angelica), cnidium rhizome (Cnidium officinalis), littorales (glossum), peppermint leaves, and chamomile.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

入浴の際に用いる医薬部外品，医薬品などをいう。入浴剤ともいう。入浴によって血液の循環を良くし，新陳代謝機能を高め，皮膚を清潔にするという効果をいっそう高めるだけでなく，保湿，保温，ストレス解消などのほか皮膚疾患や肩こり，腰痛，神経痛，リウマチなどに対する有効性を目的とする。一般に浴用剤は温泉成分の効能を期待するものと薬用植物成分の効能を期待するものとに大別される。前者は重炭酸ナトリウム(重曹)，硫酸ナトリウム(ボウ(芒)硝)，食塩，ミョウバンなどの無機塩類を成分とし，後者はトウキ(当帰)，センキュウ(川芎)，ハマボウフウ(浜防風)，ハッカの葉，カミツレなどを成分とする。

出典　株式会社平凡社世界大百科事典第２版について　情報

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