How many carbs are in 12 raw oysters?

November 9, 2025 •

3 min read

According to the USDA, one dozen raw Eastern oysters contain approximately 9 grams of carbohydrates. This low-carb profile makes them a popular choice for those on ketogenic and other low-carbohydrate diets. Beyond their minimal carb count, oysters are packed with essential vitamins and minerals that provide significant health benefits.

Quick Summary

A dozen raw oysters typically contain a very low amount of carbohydrates, making them suitable for low-carb lifestyles. The exact amount can vary by species, but it generally falls under 10 grams, with virtually no fiber. This seafood is also an excellent source of protein, healthy fats, and vital micronutrients like zinc and vitamin B12.

Key Points

Carb Count: A dozen raw oysters contains a minimal amount of carbohydrates, typically around 9 grams, making them suitable for low-carb and keto diets.
Nutrient Density: Oysters are a nutrient-dense food, exceptionally high in minerals like zinc, selenium, and iron, and vitamins such as B12 and D.
Low Glycemic Index: As a high-protein food with minimal carbohydrates, oysters have a glycemic index of 0 and will not cause a spike in blood sugar levels.
Preparation Matters: Cooking methods like frying with breading will significantly increase the carb count; for low-carb consumption, stick to raw, steamed, or grilled oysters.
Safety Precautions: When consuming raw oysters, it is crucial to source them from reputable providers to minimize the risk of bacterial contamination.

Understanding the Carbohydrate Content in Oysters

When considering how many carbs are in 12 raw oysters, it is important to look at authoritative data from sources like the USDA. A standard serving size is often referenced as a 3-ounce portion, which can be equivalent to about 2-3 medium oysters. Scaling this up helps to determine the nutritional value for a dozen.

Raw oysters are primarily composed of protein and are very low in fat and carbohydrates. Their minimal carbohydrate content is mostly due to glycogen, a stored form of glucose, which contributes to their slightly sweet flavor. For a diet focused on low-carb eating, such as the ketogenic diet, oysters are generally an excellent food choice, especially when consumed without high-carb additions like breading or cocktail sauce.

Nutritional Comparison: Raw vs. Cooked Oysters


Nutrient (per dozen)	Raw Oysters	Fried Oysters (with breading)
Carbohydrates	Approximately 9g	Significantly higher (e.g., 24g)
Protein	Approximately 19g	Varies, but often similar
Fat	5.7g	Significantly higher (e.g., 9g)
Calories	Approximately 171 kcal	Significantly higher (e.g., 195 kcal)
Sodium	286 mg	Varies, often higher

This comparison table clearly demonstrates that the preparation method has a significant impact on the final nutritional profile. The carbohydrates in fried oysters, for example, come from the breading, which is a major concern for those on low-carb diets. For this reason, consuming them raw or lightly steamed is the best option for managing carb intake.

Health Benefits Beyond the Low-Carb Advantage

Oysters are often called a 'superfood' due to their impressive array of micronutrients. Their health benefits extend far beyond just being a low-carbohydrate protein source.

Extremely High in Zinc: Oysters are one of the richest sources of dietary zinc, with a single dozen providing a very high percentage of the daily recommended value. Zinc is crucial for immune function, wound healing, and maintaining a sense of taste and smell.
Rich in Vitamin B12: A dozen raw oysters can provide several times the daily recommended intake of vitamin B12. This vitamin is essential for nerve function, red blood cell production, and cognitive health.
Source of Omega-3 Fatty Acids: Oysters provide heart-healthy omega-3 fatty acids, including EPA and DHA. These fats are known to reduce inflammation and support cardiovascular health.
Antioxidant Properties: Oysters contain a potent antioxidant called 3,5-Dihydroxy-4-methoxybenzyl alcohol (DHMBA), which helps protect the body from oxidative stress.

Sourcing and Safety Considerations

When consuming raw oysters, safety is a paramount concern. Oysters are filter feeders and can accumulate harmful bacteria, such as Vibrio vulnificus, from polluted waters. To mitigate this risk, it is essential to purchase oysters from reputable markets that can provide certification tags confirming they were harvested from clean waters. Cooking oysters thoroughly eliminates these bacteria, but for those who prefer them raw, sourcing is critical.

Raw Oysters in a Low-Carb Lifestyle

For individuals on a low-carb or ketogenic diet, raw oysters can be a versatile and nutrient-dense addition. Toppings and sauces are where hidden carbohydrates can sneak in. Traditional accompaniments like mignonette (made with vinegar and shallots) or a squeeze of fresh lemon are excellent low-carb choices. Avoiding sugary cocktail sauces is key to keeping the meal keto-friendly. Their mild carb content from glycogen does not significantly impact a well-formulated ketogenic diet plan.

Conclusion

In summary, 12 raw oysters contain a minimal amount of carbohydrates, making them an excellent protein-rich food for low-carb diets. While the exact carb count varies by species, it is typically under 10 grams per dozen. The nutritional value is significantly enhanced by their high concentrations of zinc, vitamin B12, and omega-3 fatty acids, all of which contribute to numerous health benefits. When choosing raw oysters, prioritize safety by purchasing from trusted suppliers. For more in-depth nutritional information on specific food items, consult the USDA FoodData Central database.

Frequently Asked Questions

Yes, oysters are an excellent choice for a keto diet. A dozen raw oysters typically contain less than 10 grams of carbs, and this small amount comes mostly from glycogen. They are also rich in protein and essential minerals that are beneficial for overall health.

The carb difference is significant. While raw oysters contain a small amount of naturally occurring carbohydrates, fried oysters are coated in breading, which dramatically increases the carb count. For low-carb diets, consuming them raw or lightly steamed is the best option.

Raw oysters are rich in vital nutrients, including exceptionally high levels of zinc, vitamin B12, and selenium. They are also a good source of omega-3 fatty acids, which support brain and heart health.

The carb count can vary slightly between different species of oysters (e.g., Eastern vs. Pacific oysters) and their size. However, the general nutritional profile remains consistent, with all raw oysters being low in carbohydrates.

Raw oysters contain virtually no dietary fiber and a minimal amount of naturally occurring sugar, mostly in the form of glycogen. The total carb content is primarily what needs to be considered for dietary planning.

To enjoy raw oysters safely, you should purchase them from reputable suppliers who can guarantee they were harvested from clean, certified waters. Individuals with compromised immune systems, or who are pregnant, should avoid raw oysters.

No. Shellfish allergies, including allergies to oysters, can be severe and life-threatening. If you have a known shellfish allergy, you should avoid eating oysters entirely, regardless of your diet.