In-Depth Comparison: Latisse and Lashfridays Lash Serum.

In-Depth Comparison: Latisse and Lashfridays Lash Serum.

Both Latisse and Lashfridays are lash growth serums with hundreds of positive reviews and testimonials attesting to their effectiveness in growing lashes. However there are several key differences between Latisse and our lash serum for you to consider. 

We've written this fact-based comparison of Latisse and Lashfridays for you to consider covering categories such as customer reviews, ingredients, price and side effects.

What Are Eyelash Serums

Lash Serum

Eyelash serums are liquid formulas that enhance the natural growth cycles of lashes and make them appear thicker and longer. They stimulates the lashes in their growing phase and protects them from breakage while strengthening their roots. When applied daily, these lash serums make the eyelash appear fuller, stronger, and longer. 

What Type of Lash Serum Are Latisse and Lashfridays?

The main two types of lash serums are prostaglandin-based lash serums and peptide-based lash serums. Latisse is a prostaglandin-based lash serum and Lashfridays is a peptide-based lash serum.

Lash serum ingredients

LATISSE: Prostaglandin

Prostaglandin-based lash serums contain hormones that can extend the duration of the growth phases of lashes. Latisse is a prostaglandin based lash serum containing bimatoprost - a synthetic version of prostaglandin.

Bimatoprost is a complex compound made from various fatty acids. These acids are aimed to bind or get along with the prostaglandin receptors. These receptors are present in the eyelashes, and they sometimes contribute to the thinness of the lashes.

For this, Latisse was introduced. It is the only FDA-approved medication available for increasing the eyelashes’ thickness, length, and chroma. Unlike other beauty serums, Latisse is also a prescribed medication used to treat alopecia and hypotrichosis’.

Bimatoprost, the main ingredient of Latisse, was initially developed as eye drops to cure glaucoma in patients. It was sold under the name of Lumigan. In the initial trials of this medicine, people noticed a significant change in the length of eyelashes and their health. This led to the formulation of Latisse, a bimatopost lash serum.

How Does Bimatoprost work?

Now that we know what bimatoprost is, let’s find how it works.

  • The Bimatoprost compound is credited to have an impact on the development of hair sacs. It works by growing most of the eyelashes in their Anagen phase (growing stage) of the eyelash cycle and elongating this state's overall duration.
  • This solution also helps increase the dimensions of the dermal papilla, which is the hair bulb or root.
  • It also encourages the pigment cells present in the hair follicles, which makes the eyelashes appear darker.


peptide lash serum

Peptides are chains of Amino acids. You might have heard about the importance of amino acids as these acids are the supporting and building bricks of protein chains in the human body. A peptide lacks the number of amino acids compared to protein, so increasing peptides in the body leads to better hair health.

Peptides also help in Collagen building. Collagen is basically a massive particle but helps the skin and hair to get better. But since the size of the molecule is so large, it cannot get into the skin if applied topically.

Peptides having the same constituents and being smaller in size can very well penetrate the skin and enhance the health of eyelashes. The other two proteins essential for hair and skin health are elastin and keratin, which have peptides. This is why peptides are so crucial for eyelash enhancement.

How Does The Peptide Compound Work?

The peptide serum provides the most significant peptide amino chain to the hair to strengthen it in its growth and after-growth phase.

  • The basic peptide found in lashfridays is Myristoyl Pentapeptide-17. This compound is a highly performing constituent that hydrates the peptides and makes them appear healthier, thick, and shiny. It fortifies and rejuvenates the life of eyelashes, which intensifies the results.
  • The peptide called Acetyl Tetrapeptide-3 aids in building stronger and fuller eyelashes and helps protect them from damage and breakage due to dryness. This peptide has proven to increase the strength of roots and thickness of lashes.

Other Ingredients

lash serum

Aside from their main active ingredients, Latisse and Lashfridays have the following ingredients in their serums.


  • Benzalkonium chloride - Common preservative in cosmetics. Used to prevent or inhibit the growth and reproduction of microorganisms.
  • Sodium chlorides - Otherwise known as table salt, sodium chloride is used to increase the thickness of lash serum.
  • Sodium phosphate - A buffering agent used to adjust the ph of the serum.
  • Citric acid - Used to adjust the ph of the serum.
  • Purified water - Water is used as a solvent to dissolve the serum ingredients.


  • Purified Water - Water is used as a solvent to dissolve the serum ingredients.
  • Hyaluronic Acid - Hyaluronic Acid is also used to thicken the lash serum.
  • Collagen - Collagen enhances the appearance and feel of lashes by increasing lash body, suppleness and sheen.
  • Cucurbita Pepo Pumpkin Seed Extract - The oil from pumpkin seeds helps increase hair growth.
  • Sphingolipids - Sphingolipids are complex, long chain lipids (fats) that function as conditioning ingredients.
  • Arginine - Amino acids that help condition lash hair.
  • Biotin (Vitamin B7) - Biotin adds body and shine to lash hair.
  • Keratin - Keratin is a type of protein that works by smoothing down the cells that overlap to form your lash hairs. This can make them smoother.

What are the side effects of Latisse and Lashfridays?

lash serum side effects

Side Effects of LATISSE

According to the FDA the most common side effects occuring in 3-4% of people using Latisse are:

  • Eye pruritus - dry, itchy eyes.
  • Conjunctival hyperemia - redness of the eyes.
  • Skin hyperpigmentation

Less common side effects include:

  • Pigmentation of the iris. Any Iris pigmentation is likely to be permanent and my not be noticeable for several months or years.
  • Lid pigmentation. Eyelid pigmentation has been reported although this has been reported as reversable when use of Latisse is stopped.
  • Hair growth outside the treatment area. 

Recent research also indicates there may be a risk of Enophthalmos  - shrinkage of fat around the eye, causing the eye to become sunken in.

Due to concerns about the side effects risk of prostaglandins, Latisse and any other serums containing the prostaglandin hormone, are banned from direct sale in Canada and Australia  and require a prescription in many countries.

Side effects of LASHFRIDAYS

The side effects from the ingredients in Lashfridays are limited. According to a recent study of a lash serum containing Myristoyl Pentapeptide-17, a key ingredient of Lashfridays, 6% of participants experienced temporary redness and irritiation of the eyes.

Reviews of Latisee and Lashfridays

Latisse Reviews

Latisse on the website influenster has an average rating of 4.7/5 from 265 reviews. Reviewers commonly refer to the product helping with lash length and lash thickness as well as rapid results.

"I love this product have been using it for two years and can't go without it. Price is up there but I apply it every other night now. So lasts twice as long for me." - Martha H.

Lashfridays Reviews

Lashfridays lash serum currently has a rating of 4.7/5 from approximately 300 reviews. The most common benefits mentioned in the reviews refer to lashfridays helping with lash growth and lash thickness.

lashfridays reviews

"Have been using lash Friday’s lash and brow serum for 4 weeks now. Can noticeably see a difference in length and thickness of lashes and my brows are starting to fill in." - Caroline M. 5/5

How much does Latisse and Lashfridays cost?

lash serum cost

Latisse Cost

Latisse is available in two different sizes - 3ml for one months use and 5ml for two months use. The 3ml bottle with applicators costs around USD $110. The sterile applicators are for one use only and if misplaced additional applicators will need to be purchased as they cannot be reused. 

The 5ml bottle of Latisse costs around USD $160. This works out at USD $2.67 per application compared to USD $3.67 per application for the 3ml bottle.

Lashfridays Cost

Lashfridays costs USD $39 for 3 months supply. This works out at USD $ 0.43 per application. If a twin pack is purchased for USD $59.99 it works out at USD $0.32 per application.


Below is a summary of the key differences between Latisse and Lashfridays breaking down by price, reviews, side effects and key ingredient. If you would like to try lashfridays lash serum yourself click here.


Latisse vs Lashfridays Comparison

Latisse vs Lashfridays Comparison

Categories Latisse Lashfridays
Customer Reviews Average rating of 4.7/5 from 265 reviews on influenster. Average rating of 4.7/5 from approximately 300 reviews.
Ingredients Prostaglandin-based serum containing bimatoprost. Peptide-based serum containing Myristoyl Pentapeptide-17 and Acetyl Tetrapeptide-3.
Price 3ml bottle costs around USD $110, 5ml bottle costs around USD $160. USD $39 for 3 months supply, USD $59.99 for twin pack.
Side Effects Eye pruritus, conjunctival hyperemia, skin hyperpigmentation, pigmentation of the iris, lid pigmentation, hair growth outside the treatment area, and potential risk of enophthalmos. Limited side effects reported, with 6% of participants experiencing temporary redness and irritation of the eyes.
Main Ingredient Bimatoprost (prostaglandin) Peptides: Myristoyl Pentapeptide-17, Acetyl Tetrapeptide-3

If you would like to try Lashfridays lash serum yourself, click here.