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Definitely take at least 2000IU vitamin D. there is one study showing 5000iu reduced CDAI by 100 points and that's alot. So I would say somewhere between that dosage. it boosts antimicrobial enzymes in the gut.
Caprylic never really helped my crohn's but in late 2013 after using a sugar heavy diet to gain weight I developed inflammed abscesses in both arm pits I believe linked to crohn's through hydradenitis.
I went on a no sugar, no dairy diet and took 3000mg of vitamin c daily and undecylenic acid which is similar to caprylic acid for 2 months and my crohn's improved a lot and my abscesses went away.