Obagi Nu-Cil lash vs brow serum: Differences and ingredients
Choose the eyelash serum for the upper lash line and the eyebrow serum for brows. They are not interchangeable. Both Obagi Medical Nu-Cil formulas contain dehydrolatanoprost, a prostaglandin analogue, so neither fits a search for a prostaglandin free serum.
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Before choosing Nu-Cil
Obagi publishes eye precautions for these products, including possible irritation and darkening around the eyes. Its warning also notes that products containing prostaglandin analogues may affect iris color. Stop use if you develop a reaction.
If you have an eye condition, are prone to dry eyes or styes, or are pregnant or nursing, Obagi advises speaking with your physician before use. Read the product’s full directions and precautions, linked in the sources below.
Which serum is for you?
For more defined looking lashes
Obagi Nu-Cil Eyelash Enhancing Serum
Choose the lash serum if sparse looking eyelashes are your concern. Obagi Medical’s Nu-Cil is applied to the upper lash line, with its own fine brush.
Contains a prostaglandin analogue. Read the eye safety information below before choosing it.
Shop on Amazon USFor sparse looking brows
Obagi Nu-Cil Eyebrow Boosting Serum
Choose the brow serum when you want fuller looking eyebrows. Its spoolie follows the brow shape, so it makes more sense for brows than borrowing a lash applicator.
Use on eyebrows only. This is not the interchangeable version of the lash serum.
Shop on Amazon USIf you already want both
Obagi Nu-Cil Lash and Brow Serum Set
The Nu-Cil set combines the separate lash and brow formulas. Choose it only if both areas are part of your routine; buying a set does not make either serum suitable for the other area.
Both contain a prostaglandin analogue and share the eye safety considerations below.
Shop on Amazon USWhy not use one bottle for both?
The lash product has a fine applicator for the upper lash line. The brow product has a spoolie for the wider eyebrow area. Obagi gives each product its own application instructions and says not to apply it to other areas.
Follow those directions rather than treating the similar names or shared ingredients as permission to swap them. A lash and brow set contains two products because the intended uses are different.
Is this the same as mascara or brow makeup?
No. Nu-Cil is a serum routine aimed at the appearance of lashes or brows over time. It does not give the immediate color and definition of mascara or a brow pencil.
If you want a visible makeup result today, start with our Japanese mascara guide. If you are considering a serum, make the ingredient and tolerance decision first.
Obagi describes these as cosmetic appearance products. It does not position Nu-Cil as a treatment to prevent or resolve eyelash or eyebrow loss. Sudden or unexplained hair loss is a different question to take to a clinician.
Common questions
Does Obagi Nu-Cil contain a prostaglandin analogue?
Yes. Both the eyelash and eyebrow ingredient lists include dehydrolatanoprost. Neither product is prostaglandin free.
Can I use Obagi eyebrow serum on my eyelashes?
No. Use the eyebrow serum on eyebrows and the eyelash serum on the upper lash line, following each product’s directions.
Does the lash and brow set contain a different formula?
The set combines the separate Nu-Cil eyelash and eyebrow serums. It does not make them interchangeable.
Sources
Researched October 9, 2026 using the brand’s published product information. These are shopping recommendations, not personal wear tests.