4 Serums to Grow Thicker Eyebrows Naturally (2024)

May 21, 2021 (updated February 14, 2024) — Written by

Want to know how to grow thicker eyebrows (and lashes) using the most natural ingredients possible? We made ourselves the guinea pigs for natural eyelash growth serums, so you don’t have to. Keep reading for the top four best eyelash and eyebrow growth serums for 2024.

woman holding small serum for eyebrow growth

By: Lisa Fennessy


RELATED: Makeup tips for gray eyebrows

The case for natural lash and brow serums

Okay so when I try a lash and brow serum and see noticeable growth in 30 days, I consider it my duty to share it with you! Let me first start by saying, I’ve tried several lash/brow growth serums in the past but most of them sting my eyes so I haven’t been able to test them long enough to see results.

I kinda suspect I’m experiencing irritation from castor oil which can be irritating to some people but not irritating to others (1).

Because of this, I kinda gave up on natural eyebrow growth serums—until I discovered our budget pick, below. And, our content manager Nicolle Mackinnon, has two other top picks to share. She tried and tested these for longer than 30 days each, and saw noticeable results—fuller brows, longer lashes, less breakage.

So via Nicolle’s and my combined experience, these are our top picks for brow and lash growth serums. Each formula stands out for a different reason. 

RELATED: The best facial tools for glowing skin and your guide to clean beauty.

Eyebrow growth serums ingredients

When it comes to your eyes, you don’t want to mess around. Lots of ingredients that are safe for use on other parts of your body but get a bad rap when it comes to applying near your eyes. Not only are your eyes more sensitive, but irritation and inflammation in and around your eyes can be more uncomfortable. If you’ve ever had a stye, you know! 

That’s why we’ve sought out eyebrow and eyelash growth serums that are formulated with more natural ingredients. Of course, this can mean different things to different people but for us, it means we’re skipping the prescription formulas that have a growth ingredient called bimatoprost. This has been shown to have side effects like iris darkening and eyelid hyperpigmentation; inflammation and infection; herpes simplex keratitis; and HSV dermatitis (1).

Many brow and lash growth formulas also often contain a preservative called benzalkonium chloride, which may have a cytotoxic effect on human cornea in some patients (2). So we are skipping formulas with that ingredient too. 

If you’ve had eye irritation or infection with a prescription option, these ingredients could be the reason why. 

So, if you are looking for something more natural, you’re in luck—we found other options, with organic ingredients that work JUST AS WELL (or better, since you are less likely to have eye irritation #winwin).

Some of the natural ingredients you will see included in our top pics are hair-growth enhancing green tea (3), antioxidants like vitamin E and scalp-conditioning agents like castor and argan oil. 

RELATED: The best eyebrow makeup for gray eyebrows.

Without further delay, these are our top picks for the best eyebrow growth serums.

4 natural eyebrow growth serums to try

RELATED: My current anti-aging organic skincare routine—it’s easy to replicate!

Which brow and/or lash growth serums have you tried?

xo, lisa in cursive

TNK Team Note: This article contains affiliate links. TNK uses affiliate links as a source for revenue to fund operations of the business and to be less dependent on branded content. TNK stands behind all product recommendations. Still have questions about these links or our process? Feel free to email us.


Do eyebrows grow back?

Yes, it took less than 30 days to see new growth using these natural growth serums. Learn more here.

How to grow your eyebrows?

Natural eyebrow grow serums can help to grow your eyebrows. Learn more here.

How long does it take for eyebrows to grow?

It took less than 30 days to see new growth using these natural growth serums. Learn more here.


1. Final report on the safety assessment of Ricinus Communis (Castor) Seed Oil, Hydrogenated Castor Oil, Glyceryl Ricinoleate, Glyceryl Ricinoleate SE, Ricinoleic Acid, Potassium Ricinoleate, Sodium Ricinoleate, Zinc Ricinoleate, Cetyl Ricinoleate, Ethyl Ricinoleate, Glycol Ricinoleate, Isopropyl Ricinoleate, Methyl Ricinoleate, and Octyldodecyl Ricinoleate. Int J Toxicol. 2007;26 Suppl 3:31-77. doi: 10.1080/10915810701663150. PMID: 18080873.

2. Law, K Simon; Bimatoprost in the treatment of eyelash hypotrichosis; Clinical Ophthalmology, April 26th, 2010.

3. Kwon, O S; Han, J H; Yoo, H G; Chung, J H; Cho, K H; Eun, H C; Kim, K H; National Library of Medicine, Phytomedicine, August 14th, 2007; Human hair growth enhancement in vitro by green tea epigallocatechin-3-gallate (EGCG).

By Lisa Fennessy

Lisa is the founder of The New Knew. Passionate about clean beauty, organic eats and nontoxic lifestyle, Lisa writes to create awareness. Conscious consumerism and informed decisions will impact the marketplace, our health and THE WORLD!


  1. Reply


    Do you have an opinion on the Fitglow brow & lash serum?

    1. Reply


      Hi! We haven’t finished testing it yet but so glad you asked! xo, Lisa

  2. Reply


    Hi, do you know if any of these products have been tested to help prevent or minimize chemo brow/lash loss? Thanks.

    1. Reply

      Lisa Fennessy

      Hi Cathleen! I don’t know if any of these have specifically been tested for that. If you find out, please report back! I know this information will be helpful to others as well.

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