Rodan + Fields 638-I3N-ULY Serum Review
Our verdict
A premium $100 serum from Rodan + Fields combining peptides, vitamin A (retinol), and alkyl benzoate in an all-skin-type formula with a strong 4.4-star rating from 385 reviewers and consistent monthly buyer activity.
Check price on AmazonBest for
People of any skin type who want a peptide-plus-retinol serum from a well-known premium brand and are comfortable at the $100 price point
Skip if
You are budget-sensitive, just starting with retinol and prefer a lower-concentration entry product, or need precise concentration disclosures before purchasing
- Form Serum
- Skin type All
- Key ingredients Alkyl Benzoate,Peptides,Vitamin A
- Targets Provides Vitamins
- Size 1.00 Count
- Scent Aloe
- Priced 355% above the category median ($22.00 across 291 tracked models)
Our scorecard
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Owner rating4.4/5
4.4 average across 385 owner ratings
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Popularity2.5/5
385 owner reviews, fewer than most models here
The overall score is owner satisfaction weighted by how many reviews back it, so a high rating from few reviews counts for less. The bars below show where this model stands against the other anti-aging skincare: serums, night creams, facial peels, wrinkle patches and anti-aging devices we track in this category on price, popularity and size. Context, not marks against it, and our read of the data, not a lab test.
Overview
Rodan + Fields' 638-I3N-ULY serum is priced at $100 and formulated for all skin types. The listed key ingredients are alkyl benzoate, peptides, and vitamin A, the last of which indicates the inclusion of a retinol-class ingredient. This combination is commonly used in anti-aging serums to support the appearance of smoother-looking skin and target the visible signs of aging.
The aloe-scented formula is positioned around vitamin delivery, and with 60 units purchased in the most recent month, it shows consistent buyer demand for a product at this price tier. That level of recurring purchase activity suggests the serum is retaining customers, not just drawing first-time buyers.
The 4.4-star rating across 385 reviews places it above average in buyer satisfaction. For those already familiar with retinol-class serums and looking for a brand-backed option, this is a credible choice, though the value proposition against mid-range retinol serums warrants consideration.
Pros
- Peptides plus vitamin A (retinol) targets multiple visible aging concerns
- Listed for all skin types, broader than many retinol serums
- 60 purchases last month indicates consistent repeat demand at a $100 price
- 4.4-star rating from 385 reviewers reflects above-average satisfaction
- Aloe-based scent is mild rather than heavy
Cons
- $100 is a significant spend without disclosed retinol concentration levels
- Retinol-class ingredients can cause dryness or peeling in first-time users
- Volume is listed as 1.00 Count rather than a specific ml or fl oz measurement
- Fewer than 400 reviews for a premium-priced product limits validation
Specifications
- Form
- Serum
- Skin type
- All
- Key ingredients
- Alkyl Benzoate,Peptides,Vitamin A
- Targets
- Provides Vitamins
- Size
- 1.00 Count
- Scent
- Aloe
Performance notes
Vitamin A (retinol) is one of the most studied topical ingredients for supporting the appearance of smoother, more even-looking skin over time. Peptides complement this by signaling support for firmer-looking skin. Alkyl benzoate is typically used as an emollient or texture agent in cosmetic formulas. Without concentration disclosures, it is not possible to assess how active the retinol level is, which matters significantly for both efficacy expectations and the likelihood of initial adjustment reactions.
What buyers say
With 60 purchases in the past month and a 4.4-star average from 385 reviews, this serum shows stronger-than-average commercial traction for a $100 product. Buyers are generally satisfied, and the repeat purchase signal suggests many return for it rather than switching to alternatives.
More from Rodan + Fields
Similar anti-aging skincare: serums, night creams, facial peels, wrinkle patches and anti-aging devices to consider
Frequently asked questions
Is this serum suitable for retinol beginners?
The product does not disclose the concentration of vitamin A, making it difficult to say whether it is a gentle entry-level formula or a stronger option. Retinol-class ingredients can cause initial dryness, peeling, or sensitivity when first introduced. Starting with lower-concentration retinol products and introducing them gradually is a common approach for those new to the ingredient. Consult a dermatologist if you are unsure. This is not medical advice.
What do peptides do in a serum?
Peptides are short chains of amino acids that may support the appearance of firmer, smoother-looking skin when applied topically. They are commonly paired with other anti-aging ingredients like retinol to create a formula that targets visible aging through more than one mechanism. Results vary by individual.
How does this compare to mid-range retinol serums at lower prices?
Without ingredient concentration data, a direct efficacy comparison is not possible. The Rodan + Fields brand positioning and customer-service model are factors that contribute to the premium price. Whether those factors justify the cost difference over a mid-range retinol serum is a personal decision based on your priorities and past experience with both brands.