You open a jar of natural nut butter and find a layer of oil sitting on top. Underneath, the nut and seed mixture may look thick, dry, or difficult to stir.

Natural nut butter separates because nuts and seeds naturally contain oils. When they are ground, those oils are released. Over time, gravity causes some of the lighter oil to rise while the heavier ground solids settle toward the bottom of the jar.

Why Doesn’t Every Nut Butter Separate?

Many conventional nut butters contain added stabilizers that help keep the oil and solids evenly mixed.

Research on peanut butter production explains that unstabilized nut butter is more likely to develop oil separation, while ingredients such as palm oil or other stabilizers can help hold the oil in place. A study published through Louisiana State University describes free oil separation as a common issue in natural peanut butter and examines how palm oil affects its structure.

When a nut or seed butter is made without these stabilizing fats, some separation should be expected. 

How to Stir Natural Butter

The key is to mix the oil back into the solids rather than pouring it away.

1. Place the jar on a stable surface.
2. Insert a sturdy butter knife or long spoon all the way to the bottom.
3. Slowly bring the thicker solids upward.
4. Continue folding and stirring until the oil is evenly incorporated.
5. Scrape along the bottom and sides of the jar to remove any dry pockets.

Stirring may take a little longer the first time you open the jar. Once fully mixed, the texture should become smoother and more consistent.

Avoid discarding the oil. It is naturally present in the nuts and seeds and helps create the intended texture of the product.

Should Natural Nut Butter Be Refrigerated?

Refrigeration can slow further separation and help the nut butter maintain a more consistent texture. However, it can also make the product firmer and more difficult to spread.

The best storage method depends on the specific product, its ingredients, and how quickly it will be used. Always follow the storage instructions printed on the jar.

Nut butters generally have relatively low water activity, which limits the ability of many microorganisms to grow. The U.S. Food and Drug Administration lists peanut butter among foods with low water activity. However, proper handling and storage are still important.

Use a clean, dry utensil each time you scoop from the jar, close the lid tightly, and avoid introducing water or crumbs into the product.

Why Is the Bottom of the Jar Sometimes So Thick?

As the oil rises, the heavier nut and seed particles settle. If the jar is not stirred thoroughly, the bottom can become compact and dry.

Research on unstabilized peanut butter has observed both oil separation and the formation of a firmer layer of solids at the bottom of the container.

This is why it is important to reach all the way to the bottom of the jar during the first stir. Mixing only the top layer may leave the lower portion increasingly difficult to use.

Does Temperature Affect Separation?

Yes. Warmer temperatures make oils more fluid, which may make separation more noticeable. Cooler temperatures cause the oils to become firmer, which can slow movement but also create a thicker texture.

Temperature can therefore affect how quickly separation happens and how easy the nut butter is to stir.

Oil on Top? Stir and Enjoy

Oil separation is a natural result of grinding oil-rich nuts and seeds without relying heavily on stabilizing ingredients.

The oil has not appeared from nowhere, and it does not need to be removed. It simply needs to be stirred back into the solids.

The next time you open a jar of NuttZo and see oil on top, give it a thorough stir from the bottom up. Once mixed, you will have the creamy, nutty texture the jar was meant to deliver.