The FDA announced today that it has issued 
draft guidance clarifying agency expectations on new dietary ingredients (NDI) for industry.  The guidance addresses in question-and-answer format what qualifies as  an NDI ("a dietary ingredient that was not marketed in the United States before October 15, 1994"), when an NDI notification is necessary, the procedures for  submitting an NDI notification, the types of data and information that  the FDA recommends manufacturers and distributors consider when they  evaluate the safety of a dietary supplement containing an NDI, and what  should be included in an NDI notification.
Dietary supplement manufacturers are required to notify the FDA in  advance when they intend to add a NDI to their  products.  However, in certain situations when the ingredient has been part  of the food supply (and is still considered an NDI), an NDI notification to the FDA is not required if it has not been chemically altered for use in supplements.
Under the guidance, minor loss of volatile components, dehydration, lyophilization, milling,  and formation of a tincture or a solution in water, a slurry, a powder,  or a solid in suspension do 
not chemically alter an ingredient.
However, the following are examples of processes that the FDA would consider to involve chemical alteration:
- A process which makes or breaks chemical bonds such as hydrolysis or  esterification, unless the bonds created by the process are reversed  when the ingredient is dissolved in water (e.g., creation of a soluble  salt) or during ingestion.
 
- Removal of some components of a tincture or solution in water (e.g., by  chromatography, distillation or membrane filtration), which changes the  chemical composition of the mixture.
 
-  Use of solvents other than water or aqueous ethanol (tincture) to make an extract.
 
- High temperature baking or cooking of an ingredient that has not  previously been baked or cooked, unless the process causes only minor  loss of volatile components with no other changes to the chemical  composition of the ingredient.
 
-  Changing the manufacturing method for an ingredient such that the  chemical composition is significantly different (e.g., changes that  alter the composition of materials used to make the ingredient, use of a  different solvent, use of a chromatographic matrix instead of a passive  filter).
 
- Application of nanotechnology that results in new or altered chemical properties of the ingredient.
 
-  Changing agricultural or fermentation conditions to alter the chemical  composition of the ingredient, such as by sprouting garlic or fermenting  yeast using a medium containing large amounts of sodium selenite to  create large amounts of organic selenium compounds.
 
- Fermentation using a fermentation medium different from the one used to  make conventional foods in the food supply (e.g., use of a defined  commercial growth medium to produce a microorganism previously made by  fermenting milk into dairy products like yogurt or cheese).
 
-  Use of a botanical ingredient that is at a different life stage than  previously used (e.g., making an extract from unripe instead of ripe  apples or using the mycelium instead of the fruiting body of a fungus.)
 
The guidance also states that if the manufacturing process alter the chemical composition or structure of an "old" dietary ingredient, the resulting compound is probably an NDI and an NDI notification to the FDA would be required.  For example, using a solvent to prepare an extract from a "old"  dietary ingredient creates a NDI because the final extract contains only  a fractionated subset of the constituent substances in the original  dietary ingredient.   In addition, changes that alter the composition of  materials used to make the ingredient, such as using a different part of  a plant (
e.g., using an extract of plant leaves where the root extract  from the same plant is an "old" dietary ingredient), would create a  NDI.   
The 53-page guidance document could greatly impact your business.  It is recommended that you read it carefully and discuss it with your legal and regulatory team. 
The FDA is inviting the public to submit comments about the draft guidance.  Although you can comment on any guidance at any time, to ensure that the agency considers your comments on the draft guidance before it begins work on the final version of the guidance, you should submit your comments by October 3, 2011.
For more information: Federal Register Notice for New Dietary Ingredient Notifications and Related Issues (link for submitting comments; Docket ID: FDA-2011-D-0376): 
http://www.regulations.gov/#!documentDetail;D=FDA-2011-D-0376-0001.