Rhubarb and Birch 300 ml. This hand soap is enriched with macadamia oil and panthenol, which are especially helpful for irritated and dry skin. The HUMDAKIN hand soap with rhubarb and birch helps soften and moisturize your hands in every wash and leaves your hands with a gentle fresh scent. HUMDAKIN’s liquid products are free of parabens, dyes, essential oils, chemical perfumes, endocrine disrupting substances and carcinogens. HUMDAKIN’s products contain allergy friendly perfume and only mild preservatives. HUMDAKIN’s liquid products are dermatologically testet.