PF-06651600 is being developed for treatment of inflammatory bowel disease. This study will test the bioavailability of a solid dose formulation of PF-06651600 compared to an oral solution formulation under fasting conditions and the effect of a high fat meal on the bioavailability of the solid dose formulation of PF-06651600 in healthy subjects. Safety and tolerability of the tablet and oral solution formulations of PF-06651600 will be assessed under fasting and fed conditions.