massive doses of vitamin c! seriously. i do orthomolecular every day, so im forever taking tons of vitamin C (20grams at this point).

if you don't usually take vitamin c, popping a handful of the normal release (not delayed release, not time release, etc.) tablets can usually fix constipation quickly. vitamin c has a very short half-life, so as long as you use the instant release tablets, it should be in and out, no problem.