Sodium Selenite
Last updated: February 11, 2026
Table of Contents
Quick Summary
Sodium Selenite Inorganic selenium supplement. Antioxidant mineral for immune and thyroid function.
What It Is
Inorganic selenium supplement. Antioxidant mineral for immune and thyroid function.
Compare to Similar Ingredients
- vs. selenium yeast: Both provide selenium for thyroid and antioxidant function. Sodium selenite is an inorganic salt form that's cheaper but potentially toxic in excess, while selenium yeast is organic, safer, and better absorbed.
- vs. potassium iodide: Both are trace mineral salts for thyroid health. Sodium selenite provides selenium for thyroid hormone activation and antioxidant function, while potassium iodide provides iodine for thyroid hormone production.
Why It's Used in Dog Products
Manufacturers include sodium selenite in dog food, treats, and supplements for several reasons:
- Selenium supplementation
- Antioxidant protection
- Thyroid and immune support
Quality Considerations
When evaluating sodium selenite in dog products, it's important to understand chelated versus inorganic forms, bioavailability, and balanced ratios with other minerals. This ingredient's quality and appropriateness can vary significantly based on sourcing, processing, and the specific formula it's used in.
Essential trace mineral. Organic forms (selenium yeast) have better bioavailability.
Potential Concerns
While sodium selenite can be appropriate in dog nutrition, pet owners should be aware of mineral imbalances, interactions, and appropriate levels for different life stages. Individual dogs may respond differently to the same ingredient based on their health status, age, and sensitivities.
Adequate selenium source, though organic selenium (selenium yeast) is better absorbed.
Frequently Asked Questions
Is sodium selenite safe for dogs?
Yes, sodium selenite is safe for dogs when used appropriately in properly formulated dog food. As with any ingredient, individual dogs may have sensitivities, so monitor for any adverse reactions when first introducing products containing this ingredient.
What does sodium selenite do in dog products?
Inorganic selenium supplement. Antioxidant mineral for immune and thyroid function. Dog food manufacturers include this ingredient to provide selenium supplementation and provide antioxidant protection.
Can dogs get too much sodium selenite?
Yes, excessive amounts of vitamins and minerals can cause health issues. However, properly formulated dog foods and supplements are designed to provide appropriate levels. Toxicity typically only occurs from over-supplementation or improper dosing. Always follow feeding guidelines and consult your vet before adding supplements.
Is sodium selenite natural or synthetic?
Sodium Selenite in dog food and supplements can be either natural or synthetic. Both forms can be effective, though bioavailability may differ. Premium brands often specify the form used. Natural sources may be more expensive but aren't necessarily superior—what matters most is the total amount and how well your dog absorbs it.
Related Ingredients
Analyze Your Dog's Food
Want to know what's really in your dog's food, treats, or supplements? Paste the ingredient list to get instant analysis.
Try the Analyzer Tool