What is in lash growth serum?

Key Takeaways

• Human stem cell conditioned media, rich in growth factors, is the most prominent active ingredient after water.
• The serum supports lash and brow health with biotin, panthenol, and ocimum basilicum hairy root culture extract, among over 25 ingredients.
• It’s free of prostaglandins, parabens, mineral oil, sulfate detergents, phthalates, urea, DEA, and TEA. It doesn't change eye color and isn't tested on animals. Human stem cells are ethically sourced.
• With twice-daily use on clean skin, some users see results in as little as 4 weeks (per manufacturer stats).
• Full ingredient list: Water (Aqua), Human Stem Cell Conditioned Media, Glycerin, Aloe Barbadensis Leaf Juice, PEG-8/SDMI Copolymer, Phenoxyethanol, Caprylyl Glycol, Niacinamide, Sodium Ascorbyl Phosphate, Sodium Benzoate, Hydroxyethylcellulose, Polysorbate 20, Polysorbate 60, Bis (Tripeptide-1) Copper Acetate, Caprylhydroxamic Acid, Biotin, Caffeine, Ethanol, Panthenol, Sodium Hyaluronate, Sodium Phosphate, Tocopherol, Troxerutin, Ethylhexylglycerin, Myristoyl Pentapeptide, Benzyl Alcohol, Benzoic Acid, Ocimum Basilicum Hairy Root Culture Extract, Glycine, Larix Europaea Wood Extract, Sodium Metabisulfite, Camellia Sinensis (Green Tea) Leaf Extract, Zinc Chloride.

What the Manufacturer Does Not State

• Exact concentrations or potency rankings of ingredients.
• Detailed physiological mechanisms for hair growth.
• Guaranteed timelines or outcomes for all users.
• Direct comparisons to other lash or brow serums.
• Prescription-level claims or published clinical trial evidence.

What is the main active ingredient in lash growth serums?

Human stem cell conditioned media acts as the key source of growth factors in the Factor Five Lash/Brow Growth Serum. This shows up second only to water on the ingredient list, signaling its importance in the formula. Still, the manufacturer puts clear emphasis on the blend, rather than labeling a single compound as the one “main” active.

The stem cell media is ethically sourced from human adipose tissue, never from animals, and the product isn’t tested on animals. Manufacturing happens in the USA.

Supporting players include biotin, panthenol, and ocimum basilicum hairy root culture extract. None of the listed actives is hyped above the rest; the overall blend takes center stage.

How to use:

• Shake well before every use.
• Apply twice a day to clean skin on the upper lash line and/or brows.
• Let it dry completely before other products.
• Avoid direct contact with eyes; the product may cause temporary burning if it enters. Discontinue if irritation develops.

These details help you compare this serum with other prostaglandin-free options and decide if an ingredient-led approach fits your needs.

Core actives and safety profile of the lash growth serum

How do the ingredients in lash serum actually promote hair growth?

According to the manufacturer, the Factor Five Lash/Brow Growth Serum’s blend of human stem cell conditioned media, biotin, panthenol, and ocimum basilicum hairy root culture extract works together to strengthen, thicken, and condition hair. No individual physiological mechanisms or ingredient interactions are claimed or explained.

What the brand does say:

• Expect results in as little as 4 to 6 weeks (with an asterisk, individual mileage varies).
• No promises about speeding up natural lash growth cycles or delivering the same outcome for every user.

Routine matters:

• Always use the serum on clean skin, twice daily.
• It dries clear and can layer under makeup once fully dry.

The serum does not contain prostaglandins (the group of compounds found in some prescription eyelash serums that can darken your eyelids or eye color). This point is highlighted for those seeking natural or non-prescription alternatives.

You can use the same serum for both lashes and brows. There's no separate product suggested for men or women. If irritation occurs, the advice is to stop using it.

The product makes broad claims about hair conditioning and strengthening from the combination (not splitting hairs over which component does what).

Twice-daily application steps for visible results in 4-6 weeks

What should you look for in an eyelash growth serum?

When choosing an eyelash growth serum, look for:

• Human stem cell conditioned media (for growth factors) high on the ingredient list.
• Support actives like biotin, panthenol, and ocimum basilicum hairy root culture extract.
• Prostaglandin-free formulas (to avoid eye color change risk).
• No parabens, mineral oil, sulfates, phthalates, urea, DEA, or TEA.
• Clear ethical sourcing and cruelty-free claims.
• Transparent usage directions and realistic result windows (no instant miracle promises).

The Factor Five Lash/Brow Growth Serum fits each criterion by its label and published materials.

Here's a practical scorecard you can use to compare this and other popular serums:

Who this serum is for (and who it’s NOT for)

Good fit if:

• You want a prostaglandin-free option fortified with growth factors and classic hair nutrients.
• You’re okay with waiting 4–6 weeks for possible results.
• Ethics, “free-from” promises, and US production matter to you.
• You can stick to a twice-daily, clean-skin routine and can stop use if any reaction appears.

Not for you if:

• You expect instant or guaranteed results.
• You need a prescription-only lash product.
• You can’t follow consistent application instructions.
• You want clinical trial backing or detailed science on biological mechanisms.
• You’re unwilling to monitor your skin for irritation during use.

It’s not positioned for those who want a prescription drug effect or anyone unable to commit to consistent use and a brief monitoring period.

Verdict

If you’re asking “what is in lash growth serum,” the Factor Five Lash/Brow Growth Serum provides a clear answer: a blend with human stem cell conditioned media, plus biotin, panthenol, and ocimum basilicum hairy root culture extract, free from prostaglandins and many common allergens or irritants. It’s transparent about ethical sourcing, the ingredient list, and basic application, but stops short of guarantees or clinical claims. If that fact set meets your priorities, this is a clear, ethical non-prescription alternative worth your consideration. Review the checklist, think about your goals, and if you’re interested, you can find it here. This article provides general wellness information, not medical advice.

FAQ

What natural ingredients like biotin and panthenol are used in lash serums?
Biotin and panthenol are included in this serum, working alongside ocimum basilicum hairy root culture extract to support hair strength and condition.

What is the prescription lash growth serum and its key ingredient?
The Formula Five serum is non-prescription. The manufacturer doesn't discuss prescription lash serums or their ingredients.

What are growth factors and plant extracts in lash serums?
Growth factors here come from human stem cell conditioned media. The main plant extract is ocimum basilicum hairy root culture extract, both combined with other nutrients to help fortify lashes and brows.

Which ingredients should be avoided in lash growth formulas?
This formula is free from parabens, mineral oil, sulfate detergents, phthalates, urea, DEA, and TEA. It's cruelty-free and contains no animal-derived stem cell cultures.

Last updated: August 18, 2026