TL;DR: Many baby bath products get their bright colors from synthetic FD&C dyes, which are petroleum- or coal-tar-derived and, in the U.S., are allowed to contain trace amounts of heavy metals under "acceptable limits." Some of these dyes, especially Red 40 and Yellow 5, have been studied for links to attention and behavior changes in children. None of this means bath time is dangerous — it just means color is one more ingredient worth understanding, not assuming. Here's what the research actually shows, and how to check your own shelf.
You've probably never thought twice about the color of your baby's bubble bath. It's cheerful, it's fun, it makes bath time feel a little more special — and it's easy to assume that if a product is marketed for babies, every ingredient in it, including the color, has been vetted with your child in mind.
But color in personal care products isn't there for your baby. It's there for you, standing in the aisle, deciding which bottle to pick up. And the ingredients used to create that color are worth a closer look, the same way you'd look at a fragrance list or a preservative.
What Are FD&C Dyes, and Why Are They in Baby Bath Products?
FD&C dyes (short for Food, Drug, and Cosmetic dyes) are synthetic colorants approved by the FDA for use across food, medication, and personal care products, including baby wash, bubble bath, and lotion. The six most common are FD&C Blue No. 1, Blue No. 2, Green No. 3, Red No. 40, Yellow No. 5, and Yellow No. 6. They're inexpensive, produce vivid, consistent color, and are added purely for visual appeal — they serve no cleansing or skin-care function at all.
Are These the Same Dyes Used in Candy and Cereal?
Yes. The same FD&C dyes that color your child's cereal, gummy vitamins, or fruit snacks are often the exact ones used in their bath products. Manufacturers use them because they're already FDA-certified and cheap to source, not because they were formulated with a baby's skin or a baby's bath in mind.
Where Do These Dyes Actually Come From?
Most FD&C dyes are synthesized from petroleum, though many were originally developed from coal tar and are still sometimes referred to as "coal-tar dyes" in regulatory language. This isn't inherently unsafe — plenty of approved ingredients are petroleum-derived — but it does mean these colorants are manufactured chemical compounds, not plant extracts, despite sometimes appearing on brightly colored, kid-friendly packaging that suggests otherwise.
What Does the Research Say About Dyes and Children's Behavior?
Several published studies have examined links between synthetic dyes, particularly Red 40 and Yellow 5, and attentional or behavioral changes in children. This research has largely focused on ingested dyes in food and medication rather than topical exposure through bath products, so the evidence doesn't translate directly to a wash rinsed off in the tub. Still, it's part of why California passed a law in 2024 requiring schools to phase out certain synthetic dyes from cafeteria food, and why some retailers have started reformulating kids' products without them. We think it's reasonable for a parent to factor that research in when deciding what touches — or is applied near — their child, even if the exposure route is different.
Could Trace Contaminants in Dyes Be a Concern?
This is the part that surprises most parents: FD&C dyes, and especially "lake" versions of them (dyes bonded to a metal salt for use in products), can contain trace amounts of heavy metals like lead, arsenic, or aluminum as byproducts of manufacturing. The FDA allows these at low, regulated levels it considers acceptable. The European Union, by contrast, has restricted or banned a longer list of coal-tar-derived dyes than the U.S. currently does. Neither approach means a product on your shelf is unsafe — but the difference in standards is a real one, and it's worth knowing it exists.
How Can You Tell If a Baby Wash Contains Synthetic Dyes?
Check the ingredient list for anything labeled FD&C followed by a color and number (like FD&C Red 40 or FD&C Yellow 5), or a "CI" number (Color Index), which is the international naming system for colorants. If a bath product is brightly colored — think electric blue, hot pink, or neon green — and you don't see a plant-based colorant like beet root extract or annatto listed, synthetic dye is the likely source. A colorless or naturally tinted wash isn't a downgrade; it usually just means one less unnecessary ingredient was added for the sake of appearance.
Does Kindred Naturals Use Synthetic Dyes?
No. Our Baby Shampoo & Body Wash relies on soapwort as its plant-based cleanser and skips synthetic color entirely — what you see in the bottle is what's actually doing the work, not an additive there for visual appeal.
Frequently Asked Questions
Is Red 40 banned in baby products?
No. Red 40 is FDA-approved for use in food, drugs, and cosmetics, including baby products, in the U.S. It is not currently banned, though it has been the subject of ongoing research and public debate around behavioral effects in children.
Are natural colorants like beet extract safer than FD&C dyes?
Plant-derived colorants such as beet root, turmeric, or annatto are generally considered lower-risk because they don't carry the same heavy-metal-contaminant concerns as synthetic lake dyes. They can vary more in shade from batch to batch, which is part of why manufacturers often prefer synthetic dyes for consistency.
Why does my baby's bubble bath need color at all?
It doesn't, functionally. Color has no cleansing benefit — it's added purely to make a product visually appealing on the shelf or fun in the tub.
Can synthetic dyes cause skin irritation in babies?
Some children with sensitive skin may react to synthetic dyes, though reactions vary by individual. If you notice redness or irritation after a bath, checking the ingredient list for dyes and fragrance is a reasonable first step.
How do I know if a "natural" baby wash is actually dye-free?
Read the ingredient list rather than the front label. "Natural" isn't a regulated term, so the only reliable way to confirm a product is dye-free is to look for the absence of FD&C or CI-numbered ingredients.
You don't need to overhaul your whole bathroom cabinet tonight. Understanding what's behind the color in your baby's bath products is just one more way to make an informed choice, the same way you already do with fragrance or preservatives. If you're ready to simplify that choice, you can explore our Baby Shampoo & Body Wash at shopkindrednaturals.com.
Written by Mike & Carly Pronsky, founders of Kindred Naturals.