Oil mixed with fresh thymeShelf Life, Storage, and Spoilage Guide
Pantry
Not RecommendedUnsafe
Homemade oils infused with fresh herbs (like thyme) create an anaerobic environment that can promote the growth of Clostridium botulinum, which produces a deadly toxin. Never store at room temperature.
Refrigerator
7 days
Store immediately in the refrigerator at 40°F (4°C) or below. Use within 7 days. For longer storage, herbs must be dried or the oil must be properly acidified following a tested recipe.
Freezer
Indefinitely safe from a microbiological standpoint; best quality within 6 months
While freezing stops microbial growth, the oil's texture and flavor may change. Store in airtight, freezer-safe containers. Thaw in the refrigerator.
Signs of Spoilage
- Unusual or off-odor (note: botulism toxin may not produce an odor, making it undetectable)
- Mold growth on herbs or oil surface
- Cloudiness or haziness not typical of the oil
- Bubbles or gas production
Room Temperature Safety
40°F–140°F (4°C–60°C)
Homemade fresh herb-infused oils should not be stored at room temperature due to the risk of botulism. They must be refrigerated immediately after preparation.
Safe Handling
Never store homemade fresh herb-infused oils at room temperature due to the risk of botulism.
Always use clean, sterilized containers for infusion and storage.
Ensure fresh herbs are thoroughly washed and completely dried before infusing to minimize moisture, which can promote bacterial growth.
For longer shelf life, consider using dried herbs or follow tested recipes for acidification of the oil.
Discard any homemade fresh herb-infused oil that has been stored at room temperature for any period.