Illinois has no biostimulant category. Products are classified by their claims, and most biostimulants are regulated as soil amendments under the Soil Amendment Act (505 ILCS 120), a statute in force since July 1992 and never amended. Products used for their nutrient content fall instead under the Illinois Fertilizer Act of 1961 (505 ILCS 80); products with pesticidal claims fall outside both.

Registration is required for each separately identified product before distribution, at USD 250 per product, under Section 15(a) of the Soil Amendment Act (505 ILCS 120/15(a)). There is no company licence on this pathway, in contrast to the fertilizer regime, which requires one under 505 ILCS 80/4(a-5). Registrations expire on 31 December of the year of grant, irrespective of when they are issued, so filings should be made early in the calendar year.

Illinois is a substantiation state, not a label-filing state. Section 15(b) of the Soil Amendment Act (505 ILCS 120/15(b)) requires the Director to demand evidence supporting the claims and proof of the value and usefulness of the ingredient, and the label plus all advertising literature must be filed with the application. Efficacy support should be assumed to be part of every dossier.

Two provisions of the Soil Amendment Act determine whether a product can be registered at all. Section 20(c) (505 ILCS 120/20(c)) allows an ingredient to be listed or guaranteed only with the Director's permission, only on proof of value, and only if it is determinable by laboratory methods - an ingredient that cannot be measured cannot be claimed, which is the practical obstacle for microbial consortia and undefined extract fractions. Section 15(c) (505 ILCS 120/15(c)) allows a minimum ingredient content to be set by rule, which would operate as an absolute barrier for low-dose products.

Labelling under Section 20 of the Soil Amendment Act (505 ILCS 120/20) requires the name and percentage of all soil amending ingredients and all other ingredients, approaching full formulation disclosure on a public label. This should be raised with any client holding a proprietary blend before work begins.

Indicative timelines are two to eight weeks for a straightforward filing and materially longer where claims attract review. Penalties are significant: administrative penalties to USD 500 per occurrence under Section 50 of the Soil Amendment Act (505 ILCS 120/50), and any violation is a business offence under Section 55 (505 ILCS 120/55) carrying not less than USD 1,000 plus costs.

Status : The statutory position is confirmed against 505 ILCS 120, 505 ILCS 80 and 8 Ill. Adm. Code Part 210. 8 Ill. Adm. Code Part 211 (Soil Amendments) could not be downloaded from the Department's website and has been requested from the authority; it is awaited. Three points remain provisional until it is reviewed: whether a nutrient-containing product must also be registered as a fertilizer and the resulting combined cost of approximately USD 270; whether a minimum ingredient content applies and at what level; and the applicable investigational allowances and methods of analysis.

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The sciBASICS Team.