Uncovering the Surprising Source of Vitamin D2
It has long been understood that vitamin D is primarily obtained through sun exposure (vitamin D3) or from a small number of foods, particularly fatty fish (vitamin D3) and fortified products. For a long time, food composition databases listed a vitamin D content of zero for cocoa butter. However, a 2018 study published in the journal Food Chemistry found otherwise, identifying cocoa and cocoa-based foods as previously unknown sources of vitamin D2. The research revealed that cocoa butter, along with dark chocolate, contains the highest amounts of this fungal-derived vitamin within cocoa products.
The Unique Production Process of Vitamin D2 in Cocoa Butter
The presence of vitamin D2 in cocoa butter is not inherent to the cacao bean itself but is a byproduct of its processing. The fascinating process begins during the fermentation stage, where fungi naturally contaminate the cocoa beans. These fungi produce a compound called ergosterol, which acts as a precursor to vitamin D2.
Following fermentation, the cocoa beans are traditionally sun-dried, often spread out on mats for one to two weeks. It is during this crucial step that the ergosterol in the cocoa beans is exposed to the sun's ultraviolet (UV) light, causing it to convert into vitamin D2. This newly formed vitamin D2 then accumulates in the lipids of the cocoa bean, which is later extracted as cocoa butter. The content can vary depending on factors like the duration and intensity of sun exposure during drying.
Natural vs. Fortified vs. Cocoa Butter Vitamin D
To understand the full picture, it's helpful to compare the different ways we obtain vitamin D.
List of vitamin D sources:
- Sunlight: Exposure to UVB rays allows the skin to produce vitamin D3, the primary natural source for humans.
- Dietary Sources: Few foods naturally contain significant vitamin D. These include fatty fish (salmon, sardines) and egg yolks (mostly D3). Mushrooms contain D2, especially when grown under UV light.
- Fortified Foods: Many foods, such as milk, orange juice, and cereals, are artificially fortified with vitamin D (either D2 or D3) to increase population intake.
- Supplements: Available in both D2 and D3 forms, supplements are a reliable way to meet daily requirements, especially for those with limited sun exposure.
Cocoa Butter Vitamin D vs. Common Sources
| Feature | Cocoa Butter Vitamin D (D2) | Common Dietary Sources (e.g., Salmon) | Fortified Milk (D3) |
|---|---|---|---|
| Source | Produced from fungal ergosterol and sun exposure during bean processing. | Naturally occurring in the flesh and oils of fatty fish. | Added artificially during food manufacturing. |
| Amount | Variable; depends on processing conditions. Higher in products with more cocoa butter. | Concentrated and relatively consistent, although varies by species. | Standardized and consistent; specified on the nutrition label. |
| Type of Vitamin | Exclusively Vitamin D2. | Primarily Vitamin D3. | Can be D2 or D3; often D3 in dairy. |
| Effectiveness | Bioavailable and effective at raising serum vitamin D levels, though possibly less potent than D3. | Highly bioavailable and effective for raising serum levels. | Highly effective, with D3 generally considered more potent than D2. |
| Dietary Impact | Not a major source; large quantities of high-fat, high-sugar chocolate would be needed for a significant intake. | Can provide a significant portion of daily needs with a typical serving. | Reliable daily source, especially for those unable to get enough sunlight. |
The Practical Implications for Your Diet
While the discovery that cocoa butter contains vitamin D2 is scientifically interesting, it does not mean you should rely on chocolate products to meet your daily vitamin D requirements. As noted by the researchers, the concentration is too low, especially in products with less cocoa butter like white chocolate, to be a primary source. In fact, consuming the excessive amounts needed for a substantial intake would be unhealthy due to the high fat and sugar content of most chocolate.
Therefore, a balanced diet is still crucial. Focus on traditional and fortified sources to ensure adequate vitamin D intake, especially during winter months when sun exposure is limited. It is also important to remember that cocoa butter has other nutritional components, such as beneficial fatty acids and minerals, but its vitamin D content should be considered a serendipitous detail rather than a dependable nutrient source.
Conclusion: A Nutty Discovery, Not a Daily Dose
The answer to the question, "Does cocoa butter have vitamin D in it?" is a definitive yes, but with a significant caveat. It contains naturally occurring vitamin D2, produced by a fascinating interaction between fungal precursors and sunlight during the cocoa bean's processing. However, the variable and often small quantity means it is not a practical or healthy way to address dietary vitamin D needs. For reliable intake, relying on classic dietary sources, fortified foods, or supplements remains the most effective strategy.
Cocoa and chocolate are sources of vitamin D2 - ScienceDirect