Does every jar smell the same?
No. Shea butter's natural aroma varies, so nutty and slightly smoky are useful descriptions rather than an exact scent to expect from every jar. The natural aroma varies between batches, so shea butter does not have a factory issued signature scent.1
Where the shea comes from, how the nuts are treated before extraction and how the butter is extracted all affect its quality. Shea butter can be extracted through boiling, mechanical methods or solvents. Those differences matter more than expecting all unrefined butter to have one identical smell.2
Why does refined shea butter have no smell?
Refining includes several stages: removing gums, neutralizing, bleaching and deodorizing. The process removes color and odor, leaving white, odorless butter. Refined shea butter can be odorless, so the word "butter" is not a promise of anything bakery related.12
If your priority is avoiding shea butter's natural scent, choose refined butter. If you want the natural nutty aroma, choose unrefined butter, allowing for differences between batches. Refining also changes the butter's composition and removes some naturally occurring components; it is more than a change in smell.12
Does a smoky smell mean it has gone bad?
A slight smoky note can be part of shea butter's usual aroma, so that note alone is not a reason to call it spoiled. Heat stress during processing can also produce odors associated with degradation. Smell is therefore not a reliable pass or fail test for quality: a familiar nutty or smoky aroma does not tell you everything about the condition of the butter.1
