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MD Lash Factor® Eyelash Conditioner, the original physician-invented formula by Dr. Susan Lin, M.D. Protected by US Patent 8,206,695.
Precision applicator for MD Lash Factor®. Ocular tolerance evaluated in contact lens wearers, non-wearers and people with self-assessed sensitive eyes.
Before and after photographs from the published four-week clinical study of MD Lash Factor®, in which mean eyelash length increased 42% to 53% across active groups against 20% for placebo.
Dr. Susan Lin, M.D., Physician-Inventor and expert reviewer for the Medical Board of California, is the clinical mind behind MD® products.
Clinical chart comparing the MD Lash Factor® safety profile with competitors. Independent ocular testing found no clinically significant change in intraocular pressure or visual acuity.
Scientific breakdown of MD Lash Factor® ingredients, including its patented active dechloro ethylcloprostenolamide, a cosmetic-grade prostaglandin analogue, plus conditioning agents.
MD Lash Factor® Eyelash Conditioner, the original physician-invented formula by Dr. Susan Lin, M.D. Protected by US Patent 8,206,695.
Precision applicator for MD Lash Factor®. Ocular tolerance evaluated in contact lens wearers, non-wearers and people with self-assessed sensitive eyes.
Before and after photographs from the published four-week clinical study of MD Lash Factor®, in which mean eyelash length increased 42% to 53% across active groups against 20% for placebo.
Dr. Susan Lin, M.D., Physician-Inventor and expert reviewer for the Medical Board of California, is the clinical mind behind MD® products.
Clinical chart comparing the MD Lash Factor® safety profile with competitors. Independent ocular testing found no clinically significant change in intraocular pressure or visual acuity.
Scientific breakdown of MD Lash Factor® ingredients, including its patented active dechloro ethylcloprostenolamide, a cosmetic-grade prostaglandin analogue, plus conditioning agents.
MD Lash Factor

MD Lash Factor® Eyelash Conditioner

$80.00
Reviews

Physician-Invented | Patent-Backed | Ophthalmologist-Tested

MD Lash Factor® is the original physician-formulated eyelash conditioner, developed by Dr. Susan Lin, M.D. Protected by US Patent 8,206,695, it is built around dechloro ethylcloprostenolamide, a cosmetic-grade prostaglandin analogue developed by Dr. Lin. It contains no prostaglandin analogue used for the treatment of glaucoma — no bimatoprost, travoprost, latanoprost or unoprostone — and no prescription drug of any kind.

Why Doctors Choose MD®

  • Measured in a published trial: in a randomized, double-blind, placebo-controlled clinical study, four weeks of nightly use produced statistically significant increases in eyelash length of 42% to 53% across the active groups, against 20% for placebo. All patients reported an improved appearance in the length of their lashes. Lash length was measured with microcalipers to 0.1 mm at six locations per eye, by technicians blinded to treatment assignment.
  • Examined by an ophthalmologist: in an independent four-week ocular safety evaluation of 35 subjects under Institutional Review Board oversight, there were no clinically significant changes in visual acuity, tear film break-up time or intraocular pressure, and no corneal abnormalities or superficial punctate keratopathy on slit lamp examination.
  • Suitable for contact lens wearers: that study included contact lens wearers, non-wearers and people with self-assessed sensitive eyes, with no changes in contact lens colour, scratches or deposits after four weeks of use.
  • Tested for tolerance: a repeat insult patch test in 209 subjects found no clinically significant potential for dermal irritation or sensitization. Independently assessed as non-cytotoxic, non-sensitising and non-mutagenic.
  • What to expect: some users notice mild irritation when starting. In our published trial this was transient and typically resolved within a few days of continued use. Apply one stroke along the upper lash line — more is not better.

Why MD Lash Factor®

US Patent 8,206,695 Chinese Patents ZL 200810094338.2 · ZL 201110061008.5 Published JCLT 2008 (PMID 18569264) Ophthalmologist Tested 209-Subject Patch Test 1M+ units sold since 2008 24+ countries Physician-Formulated
Physician-Formulated · Patented · Peer-ReviewedA physician-formulated, patented eyelash conditioner backed by a peer-reviewed clinical study.

Choose your size

1.5 ml
$55
6-Week Starter
2.95 ml
$99
3-Month Supply
5.91 ml
$140
6-Month · Best Value
6.91 ml Gold
$299
Largest · Most Advanced

Clinical evidence on file: Randomized, double-blind, placebo-controlled study published in the Journal of Cosmetic and Laser Therapy (2008, PMID 18569264). Four-week ophthalmologist-led in-use ocular safety study at Clinical Research Laboratories in contact lens wearers, non-wearers and self-assessed sensitive-eye participants. Independent repeat insult patch test in 209 subjects. Murine local lymph node assay. Ames mutagenicity assay conducted under U.S. FDA Good Laboratory Practice regulations.

Full clinical evidence dossier · Lash anatomy & growth cycle

We create beauty through advanced science™

Awards and Recognitions
MD Lash Factor 2011 Product of the Year Award MD Lash Factor 2008 ICMAD Cosmetic Innovator Award MD Lash Factor 2012 Reader's Choice Award
Physician-Formulatedby Dr. Susan Lin, M.D.
Free Shippingorders over $50
30-Day Returnssatisfaction guaranteed
Peer-Reviewed SafetyJCLT 2008 (PMID 18569264)

Seeing Is Believing

What to Expect After 4 Weeks of Daily Use:

· 42% to 53% statistically significant increase in eyelash length across the active groups, against 20% for placebo

· All patients reported an improved appearance in the length of their lashes

· Ophthalmologist-tested: no clinically significant change in visual acuity, tear film break-up time or intraocular pressure was observed under study conditions

Ophthalmologist Tested

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MD Lash Factor Eyelash Conditioner is a patented, physician-developed star product that has been a global bestseller in over 24 countries for nearly two decades. Its active ingredient is dechloro ethylcloprostenolamide, a cosmetic-grade prostaglandin analogue, supported by biotin, panthenol, and natural antioxidants to condition the lash line and visibly enhance the appearance of lash length, fullness, and resilience.

 

Key Benefits

  • Promotes longer, fuller, and stronger lashes
  • Helps repair and condition damaged or brittle lashes
  • Conditions lashes with supporting peptides and biotin
  • Enhances lash resilience and reduces breakage
  • Ophthalmologist-tested for use along the lash line

 

Who Can Use

  • For both men and women: Suitable for anyone seeking longer, fuller lashes (for men and women, ages 18 and above).
  • Suitable for all skin types: Gentle formula, fragrance-free, paraben-free, and ophthalmologist-tested.
  • Gentle formula: ophthalmologist-tested. If you wear contact lenses or have an eye condition, check with your eye care professional before use.
  • For thinning lashes: Ideal for those experiencing lash thinning due to aging, frequent makeup use/removal, mascara, or lash extensions.
  • For sparse eyebrows: Can also be applied to the brow area to support a fuller-looking brow after over-plucking or thinning.

 

Patented Lash Science

Patented Formula

• Physician-developed. The active ingredient is dechloro ethylcloprostenolamide, a cosmetic-grade prostaglandin analogue, supported by botanical extracts and conditioning agents.

• Conditions the lash line to support the appearance of longer, fuller lashes.

• Cited in scientific literature and professional textbooks (e.g., Harry's Cosmeticology) with strong clinical validation.

Key Active Ingredients

The active ingredient is dechloro ethylcloprostenolamide, a cosmetic-grade prostaglandin analogue. Supporting ingredients include Biotin, Peptides, Panthenol and Thiotaine, which help strengthen, hydrate and protect the lash line for the appearance of longer, fuller lashes.

Safety & Tolerance

• Clinically and ophthalmologist tested. In a four-week evaluation of 35 subjects, no clinically significant change in visual acuity, tear film break-up time or intraocular pressure was observed under study conditions.

• Free from parabens, fragrance, and harsh chemicals.

Easy Application

•Precision brush applicator designed for eyeliner-style application along the lash line.

•Just once daily—visible results within 6–8 weeks.

User Proven Results

DIVE INTO THE EVIDENCE

MD Lash Factor Eyelash Serum underwent a four-week, double-blind, randomized, placebo-controlled clinical study with 34 subjects, showing statistically significant increases in eyelash length of 42% to 53% across the active groups, against 20% for placebo.

· Dechloro Ethylcloprostenolamide – The patented active (U.S. Patent 8,206,695), a cosmetic-grade prostaglandin analogue developed by Dr. Susan Lin, M.D. and the compound evaluated in the published 2008 clinical trial.

· Biotin (Vitamin B7) – Strengthens lash roots by supporting keratin production, helping lashes appear thicker and more resilient over time.

· Panthenol (Pro-Vitamin B5) – Deeply hydrates and conditions brittle lashes, improving flexibility and reducing breakage for a fuller lash line.

· Thiotaine – A natural antioxidant derived from mushrooms that helps protect lashes from oxidative stress, free radical damage, and the effects of over-processing.

How to Use

Follow these simple steps to incorporate MD Lash Factor Eyelash Conditioner into your nightly routine:

Step 1 – Wash and dry your face thoroughly to remove any makeup or skincare residue.

Step 2 – Remove contact lenses, if applicable. Use the serum as the final step before going to bed.

Step 3 – Using the precision applicator, apply a thin, precise line of MD Lash Factor Eyelash Conditioner directly along the base (root) of the upper lash line, as you would apply liquid eyeliner. Avoid applying to the lash tips.

Step 4 – Do not apply to lower lashes. When eyes are closed during sleep, sufficient product is transferred naturally.

Frequently Asked Questions

MD Lash Factor is physician-formulated and ophthalmologist-tested. In an independent four-week ocular safety evaluation of 35 subjects under Institutional Review Board oversight with board-certified ophthalmologist supervision, no clinically significant change in visual acuity, tear film break-up time or intraocular pressure was observed under study conditions. If you wear contact lenses, have an eye condition or are under an eye care professional's care, check with them before use.

Apply once nightly to clean, dry skin along the upper lash line using the supplied fine-tip applicator. One stroke per eye is enough. Avoid applying directly into the eye. Allow the serum to absorb before applying other eye products.

In a randomized, double-blind, placebo-controlled clinical study, four weeks of nightly use produced statistically significant increases in eyelash length of 42% to 53% across the active groups, against 20% for placebo. All patients reported an improved appearance in the length of their lashes. Individual results vary with natural lash cycles and consistency of use.

New users often start with the 1.5 ml 6-Week Starter ($50). The 2.95 ml 3-Month ($99) is our most popular trial size. The 5.91 ml 6-Month ($140) is best value for a complete growth cycle. The 6.91 ml Gold Edition ($299) is our largest, most advanced size, ideal for committed users and gifting.

MD Lash Factor is the formulation behind a peer-reviewed clinical trial. Its active is dechloro ethylcloprostenolamide, a cosmetic-grade prostaglandin analogue developed by Dr. Susan Lin, M.D. and protected by U.S. Patent 8,206,695. In a randomized, double-blind, placebo-controlled study, four weeks of nightly use produced statistically significant increases in eyelash length of 42% to 53% across the active groups, against 20% for placebo, measured with microcalipers by blinded technicians. What sets it apart is not a different category of ingredient — it is that the formulation was studied, published, and examined by an ophthalmologist under IRB oversight, and that we publish what those studies found, including what they did not measure.

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