Prunes may be the most renowned natural laxative. They work because they are rich in fiber and sorbitol, a sugar alcohol with a 'osmotic effect' when ingested in large amounts.
Kiwifruit
Kiwifruit has been shown in several clinical trials to be effective in relieving constipation, without any side effects.
Rhubarb
Some study suggests rhubarb is laxative. Rhubarb includes laxative chemicals that promote intestinal contraction and movement in addition to fiber.
Acacia
Acacia powder is another example of a soluble fiber supplement that can help with constipation
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Oat
Oats are abundant in fiber, especially soluble fiber, which absorbs water to create a gel, making stools softer and easier to pass.
Chia Seed
Chia seeds are abundant in fiber, especially soluble fiber. Fiber-rich chia seeds absorb up to 10 times their weight in water, bulking stool and promoting bowel motions.
Flax seed
"Soluble and insoluble fiber in flax seeds make them laxative. Insoluble fiber increases bulk and speeds transit time, although crushed flax seeds work better.
Kefir
Drinking 500 milliliters every day for 4 weeks enhanced bowel movement frequency and consistency. Fermented milk product kefir may include probiotics."