What Are Formaldehyde Releasers – And Why Should You Know About Them?
Formaldehyde releasers are a group of preservatives commonly used in cosmetics and personal care products to prevent the growth of bacteria, yeast, and mold. They’re often found in products like shampoos, conditioners, shower gels, deodorants, soaps, nail polishes, eyelash adhesives, and even some makeup and hair styling products.
In recent years, the use of formaldehyde releasers has increased—often as a replacement for parabens, which have come under scrutiny for their own safety concerns. But while formaldehyde releasers help keep products stable and shelf-safe, they come with their own risks.
Why It Matters
When used in small concentrations, formaldehyde releasers are considered effective preservatives. However, they gradually release formaldehyde into the product over time—and formaldehyde is a known allergen and sensitizer. This means that repeated exposure, especially through leave-on products (like lotions, creams, or hair styling products), can lead to allergic skin reactions or sensitivities, even in people who haven't experienced them before.
Be Aware of These Ingredients
These are some of the most commonly used formaldehyde-releasing preservatives. If you see any of these on an ingredient label—especially in products you leave on your skin—it might be worth reconsidering your choice:
Imidazolidinyl Urea
Diazolidinyl Urea
DMDM Hydantoin
Sodium Hydroxymethylglycinate
Quaternium-15
Glutaral (Glutaraldehyde)
2-Bromo-2-Nitropropane-1,3-Diol (Bronopol)
How to Stay Informed
Read product labels carefully, especially if you have sensitive skin or have experienced unexplained irritation.
Choose “formaldehyde-free” products when possible—especially for leave-on items.
Consult a dermatologist if you suspect a sensitivity or are unsure which ingredients to avoid.
Bottom Line
Formaldehyde releasers may serve a functional purpose in cosmetic preservation, but for many, they’re a hidden source of skin sensitivity. Knowing how to spot them on ingredient labels is a simple yet powerful way to take control of what you're putting on your skin.
Your skin deserves safe, gentle care—and sometimes, that starts with just reading the fine print. All No Nothing products are free of formaldehyde releasers.