Spermidine

The category splits into three grades that are regulated and priced very differently. Standardised wheat germ extract is the volume food grade, specified on spermidine content, commonly 0.5 to 1.5 milligrams per gram in the concentrated forms, and described by the extraction process and the residual protein, starch and gluten content. It is a food ingredient with a defined matrix rather than a purified chemical.

Spermidine salts are the second grade, sold as trihydrochloride or phosphate at 98 percent minimum assay, with the related polyamines putrescine and spermine controlled as impurities because they are the closest structural relatives and the most likely process contaminants. They come as crystalline powders for research and for markets where the isolated compound is permitted.

Free base spermidine at 98 percent or above is the third, a laboratory and manufacturing intermediate sold in sealed ampoules or nitrogen blanketed bottles because of its reactivity with air.

Buyers also encounter other natural matrix ingredients specified on spermidine, including soy germ, chlorella and fermentation derived preparations. Across all forms the specification attributes that matter commercially are the spermidine assay and its method, the polyamine impurity profile, gluten status for the wheat derived grades, and documentation of the regulatory basis for the intended market, since that basis differs sharply between the matrix extract and the isolated salt.

In the United States spermidine reaches the market almost entirely as a constituent of a food derived extract rather than as an isolated chemical. Wheat germ extract standardised on spermidine is marketed as a dietary ingredient under the Dietary Supplement Health and Education Act, with current good manufacturing practice at 21 CFR Part 111, and a new dietary ingredient notification is expected where a pre-1994 marketing history cannot be shown. Isolated spermidine salts are not established dietary ingredients and have no food additive regulation or published GRAS listing, so their use in food or supplements would require a specific regulatory basis. Wheat derived material must carry the wheat allergen declaration required by the Food Allergen Labelling and Consumer Protection Act. Claims are limited to structure and function statements, and marketing that presents the ingredient as treating age related disease would make the product an unapproved drug.

In the European Union the distinction is sharper still. Wheat germ extract with a high spermidine content has been authorised as a novel food and is entered in the Union list of novel foods established by Commission Implementing Regulation (EU) 2017/2470, with the specification, the permitted food categories and the maximum use levels set out there, and with labelling conditions attached. Isolated spermidine and its salts are not authorised, so they may not be placed on the market as food or food supplement ingredients without their own authorisation under Regulation (EU) 2015/2283. Cereals containing gluten must be declared under the Food Information to Consumers Regulation, and supplements fall additionally under Directive 2002/46/EC. No health claim relating to spermidine appears on the authorised list under Regulation (EC) No 1924/2006. Codex Alimentarius has no standard covering the substance and JECFA has not evaluated it.