Before the Laboratory grades a cream, someone has to have lived with one. This bulletin begins where it should, with Blanche, and with the dermatologist who is the reason she uses any of this at all. Blanche speaks first, in her own voice. The science comes after.

Blanche’s account

Before there was a Laboratory, before anyone was comparing ingredient lists or arguing about percentages of retinol on the internet, there was Dr. Nia Terezakis.

She was my dermatologist.

And she was a special human.

Dr. Nia Terezakis was one of those people who seemed to belong particularly to New Orleans. She practiced dermatology there for more than fifty years, becoming known affectionately to generations of patients as “Dr. T.” Calling her simply a dermatologist leaves out quite a lot.

Nia began her professional life teaching art history. When she decided to become a physician, she packed everything she owned into a Volkswagen Beetle, drove to New Orleans, and enrolled at Tulane University School of Medicine. She was one of only two women in the graduating class of 1966. And because this is New Orleans, and apparently an ordinary medical-school story would not have suited her, she also designed and sewed Mardi Gras ball gowns to help pay her way through.

She went on to build an extraordinary career. She held clinical faculty positions at both Tulane and LSU. She lectured across the United States and abroad, at Yale, Stanford, Columbia, and the Mayo Clinic. She served as president of the Women’s Dermatologic Society. Her work touched hair growth, dermatologic surgery, sun-damaged skin, and retinoids, and the Dermatology Foundation later recognized her with its Clark W. Finnerud Award.

Other physicians remembered her not merely as an accomplished doctor but as a combination of innovator, scientist, and artist.

That sounds like the Nia I remember.

And then there was retinol.

Long before retinol became a beauty-industry buzzword, Nia was teaching and speaking about retinoids. She understood them as serious dermatologic tools rather than fashionable ingredients dropped into a pretty jar. She also helped develop the delivery technology meant to make a potent ingredient more tolerable on skin, and she is a co-developer of the retinol cream now sold as Green Cream.

So this test is not really two anonymous creams pulled from a drugstore shelf.

For me, they are Nia’s creams.

And we are fans of anything she touched.

I used both

I used Green Cream.

I also used Neutrogena’s retinol, the product I remember as Healthy Skin and its later versions.

And having lived with both, my verdict is surprisingly easy.

Green Cream wins on strength and performance. It was the stronger cream on my skin. I could tell the difference.

But that is not quite the end of the experiment.

Because for years, the cream I kept buying was Neutrogena.

Why?

It was cheaper. It was easy to get. And it was good.

Not good for something from the drugstore.

Good.

Green Cream gave me more. Neutrogena gave me enough, at a price that made it easy to use night after night, for years.

And that raises a better Laboratory question than which cream is stronger.

Does the best product always win?

Not necessarily.

Skincare happens in the real world. A theoretically superior cream sitting unused in a cabinet does not accomplish very much. A cream you can afford, tolerate, obtain easily, and use consistently has an enormous practical advantage.

That is especially true of retinoids, where more strength can mean more irritation. The strongest formula is not automatically the right formula for every person, or for every night.

This is where Nia was ahead of the conversation. Her work was never simply about putting more retinol in a bottle. It was about getting retinol into a form a person could actually keep using.

And on my skin, it worked.

The woman behind the cream

There is another reason I wanted this test in the Laboratory.

Nia died in September 2024, at the age of ninety. Her obituary tells the story of a woman whose interests ran far past medicine, into art, fashion, food, entertaining, and New Orleans itself. She was known for beautiful dinner parties and Southern hospitality as much as for the precision she brought to her work. Her patients traveled from around the country and the world to see her.

There is one story about Nia I love. Her colleagues were trying to get patients to wear sunscreen, because it helps prevent skin cancer. Nia understood something about people: a distant risk is not always motivating. Wrinkles, though? People understood wrinkles. So she persuaded patients to wear sunscreen by talking to them about preventing premature aging.

It worked. Her colleagues counted that knack for getting patients to comply among her real contributions.

That tells you something about the physician. She understood the science. She also understood people.

Years later I can walk into my bathroom, pick up a retinol cream, and still think about the woman who taught me about this in the first place. That is a different kind of legacy.

Products get reformulated. Packaging changes. Companies change hands. The beauty industry discovers an exciting new ingredient that dermatologists have been discussing for thirty years. Every so often, though, behind one of those products, there was an actual person.

In this case, there was Nia. A woman who taught art history, sewed Mardi Gras gowns, went to medical school when very few women did, became an internationally respected dermatologist, taught generations of physicians, and helped create Green Cream.

So yes. We will compare the creams.

Green Cream wins strength and performance. Neutrogena wins affordability and the long relationship.

But Nia wins the Laboratory.

What Felix found

Blanche’s result is the data. The science does not exist to prove her right, only to explain what she felt and to keep the claims honest.

What a retinoid is, and what it does. Retinoids are vitamin A derivatives. They act on receptors in the skin cell that raise collagen production and lower the enzymes that break collagen down, which is the pathway behind their effect on photoaged skin. Research has demonstrated this pathway, and the strongest wrinkle-and-texture evidence in the whole category belongs to prescription tretinoin. Retinol, the ingredient in both of these creams, is a milder relative: the skin has to convert it in two steps before it becomes the active form, which is why it is gentler and slower than tretinoin. Retinol still carries real, vehicle-controlled human evidence of its own, notably a study of 0.4 percent retinol on the naturally aged skin of older adults that showed modest reductions in fine wrinkles and a rise in collagen-related markers over months. The precise claim, and the only one this Laboratory will make, is that retinol has been shown to improve fine lines and skin texture modestly over months of steady use. It does not reverse aging, and no cream in this test does.

Why stronger tends to sting. Retinoids produce a well-documented early irritation, called retinization: dryness, flaking, redness, and stinging, driven by the same accelerated cell turnover that does the work. Research has demonstrated that this irritation is dose-dependent, so a higher concentration tends to irritate more, moderated by each person’s skin and by how gradually it is introduced. That single fact is the reason graduated-strength lines exist. Green Cream is sold in ascending Levels, Level 3, Level 6, and Level 9, meant to be titrated upward as skin adapts, exactly the “start low, build up” approach the literature supports. Level 9, the one photographed here, is the experienced-user end of that ladder.

The delivery-system question, kept honest. Green Cream’s pitch is its patented gel, the Green Polymer Cooling Gel, marketed as carrying a high retinol dose while limiting the usual irritation. Worth noting: Neutrogena makes a structurally identical claim across its Rapid Wrinkle Repair line. The daytime SPF cream, sold now as “Rapid Wrinkle Repair Retinol Face & Neck with Hyaluronic Acid,” runs on a “Retinol SA” delivery, a glucose complex with hyaluronic acid the brand says releases retinol steadily to ease irritation, and its companion night cream carries an “Accelerated” version of the same idea. The underlying idea is sound. Encapsulating or slow-releasing retinol demonstrably improves its stability and spreads its release over hours, and reducing the early concentration spike is a reasonable way to ease irritation. What does not exist, for either product, is a clean independent trial pitting the fancy delivery against plain retinol at the same percentage and proving it gentler in people. The fair statement is that both creams rest on the same plausible mechanism, neither shown superior to the other on delivery alone. The commonly repeated mapping of Green Cream’s Levels to 0.3, 0.6, and 0.9 percent retinol comes from resellers, not the maker, and is treated here as unconfirmed.

Why the empty bottle is real science, not an excuse. Blanche kept buying the cheaper cream, and the literature says that is not a footnote, it is the main event. Adherence to topical treatment is strikingly low in the real world, estimated at roughly one in five patients or worse, far below what people report. Irritation, cost, and a fussy routine are among the documented reasons adherence falls, and poor adherence is itself a common cause of treatment failure: the medicine works only while it is used. A milder, cheaper cream a person applies every night can therefore outperform a stronger one abandoned in a drawer. That is the Empty-Bottle Test with evidence under it.

The record, corrected where it should be. Nia is credited by Advanced Skin Technology as the creator of the stabilized-retinol delivery system behind Green Cream, and her obituary names her a co-developer of the cream. The precise history is a collaboration: the matching slow-release patent, “Slow release vehicles for minimizing skin irritancy of topical compositions,” names her colleague Gail Bazzano as inventor of record, and the two are described as having first built the idea by combining a retinoid with aloe vera gel. Crediting them both is the accurate account, and the more generous one.

The results

Category	Winner	Note
Strength	Green Cream	Plainly the more powerful performer on Blanche’s skin.
Performance	Green Cream	Based on long-term personal use, not a claim about every skin.
Affordability	Neutrogena	A drugstore cream, well under Green Cream Level 9’s $55; the exact figure could not be verified this cycle (around $20 to $30, approximate).
Accessibility	Neutrogena	On every shelf; Green Cream lives in the specialty and dermatology-office channel.
Long-term fidelity	Neutrogena	The empty-bottle winner: the cream Blanche kept replacing for years.

Green Cream wins the performance test. Neutrogena wins the empty-bottle test. Depending on what matters most to you, either victory may be the one that counts.

Above them both, Nia wins the Laboratory.

References

Sourcing note: the biography was checked against Dr. Terezakis’s published obituaries, the Dermatology Foundation tribute, and the manufacturer. Green Cream’s page and the Bazzano patent were read live on 12 August 2026, confirming the delivery-system language, the $55 Level 9 price, and that the maker states no retinol percentage, so the Level 3, 6, and 9 to 0.3, 0.6, and 0.9 mapping is a reseller figure, not a maker specification. Neutrogena’s own site and drugstore listings could not be reached, so its price here is an approximate drugstore range, not a verified figure. The verdict was locked 13 August 2026.

• Dermatology Foundation, tribute to Nia Terezakis, MD (1934 to 2024). dermatologyfoundation.org/nia-terezakis-md-1934-2024/
• Advanced Skin Technology, on the patented retinol delivery system created by Nia Terezakis, MD. advskintech.com/pages/about
• Slow release vehicles for minimizing skin irritancy of topical compositions, US Patent 5,721,275 (inventor of record: G. Bazzano). patents.google.com/patent/US5721275A
• Kang et al., improvement of naturally aged skin with topical retinol, Arch. Dermatol., 2007.
• Restoration of collagen in photodamaged skin by tretinoin, New England Journal of Medicine, 1993. nejm.org/doi/full/10.1056/NEJM199308193290803
• Use of retinoids in topical antiaging treatments, review, Advances in Therapy, 2022. link.springer.com/article/10.1007/s12325-022-02319-7
• Narsa et al., strategies to reduce retinoid-induced skin irritation, Dermatology Research and Practice, 2024. onlinelibrary.wiley.com/doi/10.1155/2024/5551774
• The mechanism of retinol-induced irritation. pubmed.ncbi.nlm.nih.gov/14615068/
• Encapsulation and controlled release of retinol. pubmed.ncbi.nlm.nih.gov/29604311/
• Lo et al., adherence to treatment in dermatology, a literature review, JEADV Clinical Practice, 2024. onlinelibrary.wiley.com/doi/full/10.1002/jvc2.379
• Poor adherence to self-applied topical treatment in actinic keratosis. ncbi.nlm.nih.gov/pmc/articles/PMC10253365/