From a good business practices viewpoint, if you're manufacturing anything, doing a process validation is a good idea, imo. Also, what you need to do may depend on what facet you're talking about - manufacturing, using computerized systems, sterilization, etc.
Below are some things I found on the FDA website that may help.
Guidance for Industry: Current Good Manufacturing Practice in Manufacturing, Packaging, Labeling, or Holding Operations for Dietary Supplements; Small Entity Compliance Guide
http://www.fda.gov/food/guidanceregulation/guidancedocumentsregulatoryinformation/ucm238182.htm
PART 111 CURRENT GOOD MANUFACTURING PRACTICE IN MANUFACTURING, PACKAGING, LABELING, OR HOLDING OPERATIONS FOR DIETARY SUPPLEMENTS
http://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/cfrsearch.cfm?cfrpart=111
Good Manufacturing Practices (GMPs) for the 21st Century - Food Processing
http://www.fda.gov/food/guidanceregulation/cgmp/ucm110877.htm
FD&C Act Chapter IV: Food
http://www.fda.gov/RegulatoryInform...eticActFDCAct/FDCActChapterIVFood/default.htm
GMPs - Section Three: Previous Surveys of Manufacturing Practices in the Food Industry
http://www.fda.gov/food/guidanceregulation/cgmp/ucm110912.htm
Proposed Rule: Current Good Manufacturing Practice
and Hazard Analysis and Risk-Based Preventive
Controls for Human Food
http://www.fda.gov/downloads/food/guidanceregulation/ucm345224.pdf
Center for Food Safety and Applied Nutrition (CFSAN) Plan for Program Priorities, 2013-2014
http://www.fda.gov/aboutfda/centersoffices/officeoffoods/cfsan/whatwedo/ucm366279.htm
Computerized Systems in Food Processing Industry
http://www.fda.gov/iceci/inspections/inspectionguides/ucm074871.htm
Food CGMP Modernization ? A Focus on Food Safety
http://www.fda.gov/food/guidanceregulation/cgmp/ucm207458.htm