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doi: 10.1186/ar3071 302 AngiolilliCGrabiecAMFergusonBSOspeltCMalvar FernandezBvan EsIEet al

You-Gui-Wan, composed of 10 medicinal materials, including Shou Ti Huang ( Rehmannia glutinosa ), Shan Yao ( Dioscorea opposita ), Shan Chu Yu ( Cornus officinalis ), Du Zhong ( Eucommia ulmoides ), Gou Qi Zi ( Lycium chinense ), Yu Si Zi ( Cuscuta australis ), Pao Fu ( Aconitum carmichaeli ), Jou Kue ( Cinnamomum cassia ), Lu Jiao ( Cervus elaphus ), and Dang Gui ( Angelica sinensis ) [165]

Preservatives Preservative- Picture courtesy: USADA This product is also suspectable to microbial growth and reproduction, so, preservatives, such as phenol, metacresol, and, benzyl alcohol are incorporated during its preparation to deter microbial presence

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In one study, 2.5 mg/day of biotin for 615 months increased nail thickness by 25% in patients with brittle nails