Are peroxide shampoo side effects dangerous in children?

Question

Hello doctor,

I was using a child’s hair lightening shampoo on my daughter’s hair from 15 months old until she was four years old. It was designed for toddlers and children and had great reviews.

They said it was all natural ingredients, but I have since found out that it contained two to four percent Hydrogen peroxide, and I stopped using it straight away. I used it once a week on her and a few times, a little bit ran into her eyes, and it stung, but I cleaned them.

I believed it was completely natural, like they said.

Could this have affected her brain or eyes?
Could it have gone in through the soft fontanelle when she was so young?
Could it possibly cause cancer or issues in the future with the eyes, even?
Or would she be more susceptible to sun damage or skin cancer on the scalp or eyes?

She was diagnosed with autism at 3. She is now 5 with no other issues.

Kindly help.

Thank you.

Answer 1

Hello,

Welcome to icliniq.com.

I understand your concern,

Using a children’s hair-lightening shampoo with 2 to 4 % Hydrogen peroxide once weekly is very unlikely to have caused any harm to your daughter’s brain, eyes, or long-term health. Such products act primarily on the hair surface and cannot normally penetrate through the scalp or fontanelle into deeper structures like the brain.

In addition, brief eye stinging from accidental splashes is generally limited to temporary irritation. Lasting eye damage is typically considered only if there are clear, persistent symptoms, which you have not described here.

Based on current understanding, there is no evidence that this type of exposure is linked to conditions such as cancer, autism, or future eye or scalp disease. Since she is now well at the age of 5, this is reassuring and suggests that there are no ongoing effects from the past exposure. At this stage, it is reasonable to focus on her overall growth and development in general.

You also did not mention details about her developmental progress. It would be helpful to review for any autism-related or behavioral symptoms, along with ensuring age-appropriate developmental follow-up as part of routine observation.

So, the information provided does not indicate cause for concern related to the exposure you described. So, I would like to add that.

I hope this helps.

Thank you.