Is it safe to buy peanut butter in plastic jars?
Based on 2 peer-reviewed studieskitchen
Verdict: Use Caution
Not ideal. Peanut butter is fatty and sits in plastic for months.
What's actually in it
Peanut butter is mostly fat and oil. Fat pulls plasticizers out of plastic jars faster than water or dry food. Long shelf time means long contact.
What the research says
A 2025 study found fatty foods in plastic were top dietary phthalate sources. A 2025 study linked phthalates to slower infant neurodevelopment.
Buy peanut butter in glass jars or grind your own at natural food stores. Transfer plastic-jar brands to glass at home.
The research at a glance
| Study | Journal | Year |
|---|---|---|
| Plastic additives in the diet. | J Hazard Mater | 2025 |
| Impact of prenatal phthalate exposure on newborn metabolome. | Nat Commun | 2025 |
What to use instead
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