Kozisol serum is a topical product commonly used for skin care. Generally, topical products like Kozisol serum are considered safe for breastfeeding mothers because they have minimal systemic absorption, meaning very little of the product enters the bloodstream and thus is unlikely to affect breast milk or the nursing baby.

However, it is important to consider the following:

• Check the ingredients: Ensure there are no harmful substances or strong medications in the serum that could be absorbed through the skin.
• Avoid application on the breast area: To prevent any chance of the baby ingesting the product, avoid applying the serum directly on or near the nipples.
• Consult your healthcare provider: For personalized advice, especially if you have sensitive skin or any underlying conditions.

If you notice any irritation or unusual symptoms in yourself or your baby after using the serum, discontinue use and seek medical advice.

In summary, Kozisol serum is likely safe for use during breastfeeding when used appropriately, but confirming with your doctor is always the best approach to ensure safety for you and your baby.