Psyllium seed from Plantain (Plantago ovata). The seed husks are used in laxatives because the outer seed coats are high in fiber and mucilage content. The term mucilage describes a group of clear, colorless gelling agents derived from plants by milling or grinding of the outer layer of the seed. The milled seed mucilage is a white fibrous material that is hydrophilic and thus strongly binds to water. Upon absorbing water, the clear, colorless, mucilaginous gel that forms increases in volume by tenfold or more, producing the dietary fiber bulk. SEM X11
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