WelprWelpr

As an Amazon Associate, we earn from qualifying purchases. Affiliate links do not affect our ratings. Learn more.

Best Non-Toxic Hair Serums

We vetted hair serums against the Welpr Standard and here are our top picks.

Camille May

Camille May

Cofounder & Product Curator

Olushola M. Awoyemi

Olushola M. Awoyemi

Medical Reviewer, PhD

Here's what we look for:

  • Simple formulations using fully natural or safe synthetic ingredients
  • No parabens, PEGs, phthalates, harsh sulfates, BHA/BHT, artificial dyes, formaldehyde or formaldehyde releasers, or undisclosed synthetic fragrance (unless certified safe)
  • Minimal, necessary preservatives only
  • Trusted third-party certifications when available
  • Transparent sourcing, ingredients, and manufacturing practices

Best Non-Toxic Hair Serums

On Welpr, terms like "non-toxic," "safer," "cleaner," "healthier," and "vetted" are editorial labels based on our own standard for product assessment. They are not guarantees, certifications, or medical claims. Learn more.

Nourish Hair & Scalp Serum

Captain Blankenship

Nourish Hair & Scalp Serum

Est. Price$48
10.0
Performance
Ingredient Safety

Meets the Welpr Standard

Buy Now

on Amazon

Free email mini-course

Welpr Blueprint: Go Non-Toxic Mini-Course

The 80/20 guide to going non-toxic the easy way.

No spam. Unsubscribe anytime.

Deep Magic Hair + Scalp Serum

Under Luna

Deep Magic Hair + Scalp Serum

Est. Price$45.90
8.7
Performance
Ingredient Safety

Meets the Welpr Standard

Buy Now

on Amazon

Mighty Majesty Fortifying Hair Serum

RANAVAT

Mighty Majesty Fortifying Hair Serum

Est. Price$70
9.2
Performance
Ingredient Safety

Meets the Welpr Standard

Buy Now

on Amazon

Women's Hair Serum

Nutrafol

Women's Hair Serum

Est. Price$69
7.8
Performance
Ingredient Safety

Meets the Welpr Standard

Buy Now

on Amazon

Restorative Hair Serum with 1% Hyaluronic Acid + Plant Keratin

Typology

Restorative Hair Serum with 1% Hyaluronic Acid + Plant Keratin

Est. Price$99
7.0
Performance
Ingredient Safety

Meets the Welpr Standard

Buy Now

on Amazon

How to Swap to Non-Toxic hair serums:

Here's how to swap to non-toxic hair serums:

What to know about hair serum

Hair serums are leave-in products that stay on your hair and scalp for hours or even all day. Because they sit on skin and are applied close to your face, the formulation matters more than with rinse-off hair products.

  • Serums often contain synthetic fragrances, silicones, and preservatives that can build up with daily use.
  • Welpr focuses on clean formulations, fragrance transparency, and the absence of endocrine disruptors like parabens and phthalates.

Review what you already use

Check the serum you currently use by scanning it with the Welpr Personal Care and Cosmetic Scanner. It will flag any concerning ingredients so you can see how your product stacks up.

  • Look at the ingredient list for the word "fragrance" or "parfum"—these can hide undisclosed synthetic ingredients.
  • If you use more than one leave-in hair product, scan the one you apply most often or closest to your scalp first.

Use your current serum more carefully

If you're not ready to switch yet, small changes in how you apply your serum can reduce what your skin absorbs. This is especially helpful if your serum contains synthetic fragrance or harsh preservatives.

  • Apply serum to the mid-lengths and ends of your hair rather than directly on your scalp.
  • Use a smaller amount than you normally would—a little often goes further than the bottle suggests.

Choose a cleaner hair serum

Look for serums with simple, functional ingredients like plant-based oils and natural extracts. Fragrance-free options are best, but if scented, the fragrance should come from essential oils or plant extracts rather than synthetic sources.

  • Certifications like EWG VERIFIED™ or MADE SAFE® are a good sign, but Welpr still reviews every formula individually before approving it.
  • Click the button above to shop Welpr Approved hair serum.
Camille May

Camille May

Cofounder & Product Curator

Camille May is the co-creator of Welpr and a guide for clean living. After selling her last company in the health food space, she went non-toxic while working to heal an autoimmune condition....

View full profile
Olushola M. Awoyemi

Olushola M. Awoyemi

Medical Reviewer, PhD

Olushola M. Awoyemi (aka Shola) is a board-certified toxicologist and a research scientist with a PhD in Environmental Toxicology. Shola's long-term ambition is to be recognized as a world-renowned expert in toxicology,...

View full profile