Psyllium consists of the indigestible seed husks of a plant native to India and Pakistan. The seed husks are a good source of soluble fiber, and thus act as a natural laxative. As such, they are also a popular ingredient in colon cleansing and detox regimens, and are also used as a binder in gluten-free baking. However, some people cannot tolerate psyllium either due to taste and texture, or because of side effects such as gas and bloating.
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Flaxseed is widely available, and is high in soluble fiber and omega-3 fatty acids. The soluble fiber content may make it an effective natural laxative, but MedlinePlus notes that no studies have actually proven this assumption. Flaxseed has a pleasant, nutty taste.
Oat bran is another food high in soluble fiber, and bran powder is used as an ingredient in over-the-counter laxative formulas. It can sometimes cause gas and bloating, so add it to your diet gradually to let your body get used to it.
Pectin is a soluble fiber found in high amounts in certain fruit, especially apples. Apple pectin can be found in capsule form as a dietary supplement marketed for lowering cholesterol and increasing dietary fiber; it also acts as a natural laxative. Apple pectin is another popular component of detox and cleansing regimens. If you're just after the daily dietary fiber content, however, there's no need for expensive capsules -- an apple a day will suffice.
Dried fruit, especially prunes and figs, are high in fiber and have been used as a natural laxative for centuries. You can eat them as-is for a snack, add them to your hot or cold cereal, or stew them and eat as a breakfast side dish or over whole-wheat pancakes.