NULASTIN BROW Shape Altering Serum is a premium eyebrow serum designed to improve the appearance of sparse, thin or over-plucked brows. Its formula contains peptides, elastin, keratin and isopropyl cloprostenate, a prostaglandin analogue associated with hair-growth effects.
The brand claims users can see visible improvements within six weeks, with further results after 12 weeks. Its advertised clinical results come from a 12-week study involving 34 participants. Ulta lists the serum at approximately 4.3/5 stars from 2,316 reviews, suggesting generally positive customer feedback.
However, the prostaglandin analogue is an important consideration because ingredients in this family may cause irritation, skin darkening and other unwanted effects around the eyes. The brand itself warns users to avoid eye contact and discontinue use if redness or irritation occurs.
Our verdict: NULASTIN Brow Serum may help improve the appearance of thin eyebrows, but its premium price and prostaglandin-related precautions mean it is not the right choice for everyone.
What Is NULASTIN Brow Serum?
NULASTIN BROW Shape Altering Serum is a leave-on eyebrow treatment developed to support fuller-looking brows.
The product is marketed toward people experiencing:
- Naturally thin eyebrows.
- Sparse or uneven brow growth.
- Over-plucked eyebrows.
- Age-related brow thinning.
- Loss of visible brow density.
It comes in a small 3 ml (0.1 oz) tube with a specially designed spoolie-style applicator. The brush is intended to distribute serum across the eyebrow area rather than simply coating the existing hairs.
The brand recommends applying it twice daily, in the morning and evening, to clean, dry eyebrows.
NULASTIN Brow Serum Reviews: What Are Customers Saying?
Customer feedback is generally encouraging, although experiences vary.
Ulta lists the product at approximately 4.3 out of 5 stars from 2,316 reviews. This is a substantial review sample and suggests that many customers are satisfied with their purchase.
Positive customer reviews
Customers who like the serum commonly mention:
- Fuller-looking eyebrows after several weeks.
- Visible improvement in sparse areas.
- More defined eyebrow shapes.
- Convenient application.
- Satisfaction with results after consistent use.
One Trustpilot reviewer reported seeing fuller brows after less than six weeks of using both NULASTIN’s brow and lash serums. Another customer described noticeable eyebrow growth after approximately five weeks.
These are individual experiences rather than proof that every user will see comparable results.
Negative customer reviews
Not all feedback is positive. Some customers report:
- Itching and redness around the eyes.
- Burning or irritation.
- Darkening of the eyelid area.
- Concerns about the amount of serum in the tube.
- Products arriving unusually thick, dry or difficult to dispense.
- Disappointment with the price relative to the amount supplied.
One Trustpilot reviewer described significant itching and redness after using the serum. Another reported changes in eyelid appearance and irritation while using NULASTIN products. These are personal reports, not proof that the serum caused every symptom described. However, they reinforce the importance of understanding the formula’s potential risks.
ComplaintsBoard also contains reports of tubes arriving with dried or insufficient product. Its complaint sample is small, so it should not be treated as representative of all customers.
Customer-review takeaway: Many users report fuller-looking brows, but irritation, product-quality complaints and the high price are meaningful drawbacks.
Ingredients: What Makes NULASTIN Brow Serum Different?
The formula contains several ingredients intended to support eyebrow appearance and hair strength.
1. Myristoyl Pentapeptide-17
This peptide is used in cosmetic hair and lash formulations. NULASTIN describes it as a signal peptide intended to support the appearance of stronger, fuller eyebrows.
2. Elastin protein
The formula includes sh-Polypeptide-50, identified by the brand as a biomimetic elastin protein.
Elastin is associated with flexibility and structure in the body. In this cosmetic formula, it is marketed as supporting the appearance and condition of brow hairs.
3. Keratin
Keratin is a structural protein associated with hair. Its inclusion is intended to support stronger-looking eyebrow hairs and improve their cosmetic appearance.
4. sh-Polypeptide-62
NULASTIN describes this ingredient as a signal protein intended to support the hair-growth cycle.
The brand’s ingredient explanations are product-development claims; they should not be interpreted as proof that each ingredient independently produces measurable eyebrow growth.
5. Isopropyl Cloprostenate
This is the ingredient that deserves the most attention.
Isopropyl cloprostenate is a prostaglandin analogue. Prostaglandin-related compounds are used in some cosmetic lash and brow products because of their association with hair-growth effects.
However, this ingredient family can also be associated with unwanted effects around the eyes, including irritation and changes in pigmentation. NULASTIN specifically identifies the ingredient on its product page and includes precautions for its use.
People with sensitive skin or existing eye conditions should be particularly cautious. Consult an eye-care professional before using it if you have concerns about the ingredient.
Does NULASTIN Brow Serum Actually Work?
There is some evidence supporting the brand’s claims, but it is important to understand the limitations.
NULASTIN advertises a 12-week clinical study involving 34 participants. The brand reports the following results:
| Advertised result | Reported percentage |
|---|---|
| Participants noticing visible new growth | 100% |
| Participants reporting fuller, more defined brows | 97% |
| Participants noticing improvement in thinning | 97% |
| Participants noticing more brow hairs where applied | 97% |
The brand also advertises improvements of up to 60% in thicker-looking brows.
These figures are encouraging, but the study was relatively small. The results should not be interpreted as a guarantee that every buyer will achieve the same outcome.
We would also distinguish between visibly fuller eyebrows and proven long-term restoration of damaged or inactive hair follicles.
Realistic expectation: Some people may notice improvement within six to 12 weeks, but individual results can differ depending on genetics, the cause of eyebrow thinning, consistency and tolerance of the formula.
How Long Does NULASTIN Brow Serum Take to Work?
The brand says noticeable improvements may begin around six weeks, with more substantial visible results by 12 weeks.
Its recommended routine is:
- Clean your eyebrows and surrounding skin.
- Allow the area to dry completely.
- Apply the serum in short strokes along the brows.
- Use it twice daily, morning and evening, as directed.
- Allow it to dry before applying makeup or other products.
Dermstore states that one 3 ml tube is intended to last approximately four to six weeks when used as directed.
This means a 12-week trial may require more than one tube.
NULASTIN also says that continued use is necessary to maintain results and that eyebrows may gradually return toward their original appearance after stopping.
NULASTIN Brow Serum Side Effects and Safety
This is the most important section to read before purchasing.
The brand’s official product warning says the formula contains a small amount of isopropyl cloprostenate, a prostaglandin analogue. It advises users to:
- Use the product only as directed.
- Avoid getting the serum into the eyes.
- Rinse with cool water if direct eye contact occurs.
- Stop using it if redness or irritation develops.
- Seek medical advice if irritation persists.
- Patch test first if prone to sensitivity.
- Avoid use during pregnancy or nursing.
- Consult a doctor before use if being treated for an eye or serious medical condition.
Potential concerns with prostaglandin-related cosmetic ingredients include eye-area irritation and changes in skin pigmentation. Some products in this ingredient family have also been associated with changes in the appearance of tissue around the eyes.
The brand reports that its 12-week study recorded no related adverse events. However, a small study cannot rule out uncommon reactions or guarantee that every individual will tolerate the product.
If you experience persistent redness, swelling, pain, vision changes or significant irritation, stop using the product and seek medical advice.
NULASTIN Brow Serum Price: Is It Worth the Money?
NULASTIN is positioned as a premium eyebrow serum.
The official website lists the 3 ml product at:
- One-time purchase: $84.
- Subscription price: $71.40, with a 15% discount.
The subscription listing says one tube lasts approximately five to six weeks when used twice daily. It also advertises recurring delivery and cancellation flexibility. Check the current terms before subscribing.
At this price, a full 12-week routine can become expensive because more than one tube may be needed.
For shoppers in India, the US price should not be treated as the final landed cost. Shipping, currency conversion, customs duties and taxes may increase the total. Check whether the seller ships to your address and review the final checkout amount.
NULASTIN Brow Serum Pros and Cons
Pros
- Positive overall customer ratings.
- Small clinical study supporting the brand’s visible-results claims.
- Peptides, elastin and keratin in the formula.
- Convenient spoolie applicator.
- Designed specifically for eyebrow application.
- Brand offers a stated performance guarantee, subject to its terms.
Cons
- Expensive compared with many basic brow serums.
- Contains a prostaglandin analogue.
- Potential for irritation and unwanted eye-area effects.
- Requires consistent twice-daily application.
- Results are not guaranteed.
- Ongoing use may be needed to maintain results.
- Some customers complain about product quantity and dispensing.
Is NULASTIN Brow Serum Legit?
Yes. NULASTIN is an established beauty brand with an official website, retail listings and a substantial customer-review presence.
Ulta lists thousands of reviews for the brow serum, and the product is also sold through Dermstore. These listings provide more evidence of an established product than would be available for an unknown online-only brand.
However, product legitimacy and product suitability are two different questions. The formula’s prostaglandin analogue, premium price and reports of irritation deserve consideration.
The brand also advertises a 100% Performance Guarantee. Read its terms and conditions before purchasing, particularly if you are buying internationally or through a third-party retailer.
Final Verdict: Should You Buy NULASTIN Brow Serum?
NULASTIN Brow Serum is an interesting option for people who want fuller-looking eyebrows and are willing to follow a consistent routine. Its customer ratings are encouraging, and the brand provides results from a 12-week clinical study.
However, we would not recommend buying it without considering its ingredient list. Isopropyl cloprostenate is a prostaglandin analogue, and the potential for eye-area irritation and other unwanted effects makes this more than an ordinary conditioning brow serum.
The $84 price is another drawback, especially because one tube may last only four to six weeks.
Our verdict: A potentially effective but expensive brow serum that requires careful consideration of its safety profile. If you have sensitive skin, eye conditions, are pregnant or nursing, or are uncomfortable using a prostaglandin analogue near your eyes, speak with a qualified healthcare professional and consider a prostaglandin-free alternative.
Frequently Asked Questions
1. Does NULASTIN Brow Serum really grow eyebrows?
Some customers report fuller-looking brows, and the brand advertises positive results from a 12-week study of 34 participants. Individual results are not guaranteed.
2. How long does NULASTIN Brow Serum take to work?
The brand says visible improvements may begin around six weeks, with more noticeable results by 12 weeks.
3. Does NULASTIN Brow Serum contain prostaglandins?
It contains isopropyl cloprostenate, a prostaglandin analogue. This is an important consideration when evaluating potential side effects.
4. Can NULASTIN Brow Serum cause irritation?
Yes, irritation is possible. Customer reports include itching, redness and burning. The manufacturer advises stopping use if irritation occurs.
5. Can I use NULASTIN Brow Serum every day?
The brand recommends twice-daily application to clean, dry eyebrows. Do not exceed the recommended frequency.
6. How long does one tube last?
The 3 ml tube is intended to last approximately four to six weeks with twice-daily use.
7. Do I need to keep using NULASTIN Brow Serum?
The brand says continued use is needed to maintain results. Brows may gradually return toward their original appearance after discontinuation.
8. Is NULASTIN Brow Serum safe during pregnancy?
The manufacturer advises against using the product during pregnancy or nursing. Follow that warning and consult your healthcare professional.
9. Is NULASTIN Brow Serum worth the price?
It may be worth considering if you want a dedicated brow-growth product and accept its ingredient-related precautions. However, its high price and potential side effects make it a less obvious choice for people seeking a gentle everyday brow conditioner.
Nikhil Sharma is the author and researcher behind Review Trails, where he shares shopping website reviews, product insights, and scam or legit website analysis. He focuses on providing honest, easy-to-understand information that helps readers make safer and smarter online purchasing decisions.