For Constipation, Herbipedia recommends: Fennel has calmative action to help create a soothing mucus for the stool impaction to move through your colon.
What form should I take it?
Fennel Vinegar:Take 1tsp of fennel seeds and ground with back of a spoon , Warm ½ cup of cider vinegar. Place crushed fennel seeds in vinegar. Now, place saucer over cup to trap volatile oils that are a vital medicinal part of fennel leave to cool.
Once cool drain seeds from vinegar and place in jar.
When to take:
1Tbsp in warm water, up to three threes daily.
Vinegar will keep for 1 year.
Note : cider vinegar contains significant amounts of pectin, which is a water soluble fiber which coupled with depurative substance Fenchone form then fennel work together to move stool.