Cooking oils, pressed seed oil, and infused oils sold direct to Iowa customers
A straightforward pressed or bottled cooking oil with no garlic, fresh herbs, or other low-acid additions is a shelf-stable, non-TCS good and fits Iowa's cottage food exemption cleanly.
Iowa's own definition of time/temperature-control-for-safety food specifically names garlic-in-oil mixtures that aren't modified to prevent bacterial growth — this is a known botulism risk pathway, so any garlic- or fresh-herb-infused oil needs a validated, documented process (typically acidification) before it can be sold outside a licensed facility.
For any infused oil you sell, keep batch records showing how you modified the product to prevent pathogen growth, and label plainly with ingredients, contact info, and the exemption statement if selling as cottage food.
| Item | Rule | Regulator |
|---|---|---|
| Plain pressed/cooking oil, unmodified | Cottage food eligible; no license | Iowa Code 137F.20 |
| Garlic-in-oil, fresh herb-in-oil (unmodified) | Treated as TCS; not cottage food eligible as-is | Iowa Code 137F.1 (TCS definition) |
| Acidified/validated infused oil | May qualify with documented process and testing | Iowa Code 137F.20 / FDA process authority |
| Labeling | Name/contact, common name, ingredients, exemption statement | Iowa Code 137F.20(2) |
| Wholesale sales | Requires a licensed food establishment | DIAL |
Garlic and other low-acid ingredients suspended in oil create an oxygen-free environment that's a known risk factor for botulism-causing bacteria, which is why Iowa's food code explicitly treats unmodified garlic-in-oil as a TCS food regardless of how it looks or tastes.
Selling the dry herbs separately from the oil, for the customer to combine themselves, sidesteps the infused-oil issue entirely and keeps the product in the simpler dried-goods cottage food category.
Typically this means acidifying the product (lowering pH) through a validated recipe, similar to the acidified-food process used for pickles — get guidance from a process authority before selling any infused oil at scale.
Any fresh, low-acid ingredient suspended in oil carries a similar theoretical risk profile; garlic is just the most commonly cited example. When in doubt, treat any fresh herb-in-oil product with the same caution.