How Far Can You Trust Hair-Growth Serums Labeled “Contains ○○ Factor”? — Dr. Moriwaki Organizes Literacy Around Growth Factor Label Claims From the Medical Perspective of Stem Cell Conditioned Media2026.08.12

“Contains EGF,” “Contains FGF,” “Hair-Growth-Factor Blend” — the packages of hair-growth tonics and scalp serums lined up in drugstores and online now feature an endless stream of “contains X factor” claims. Feeling that “this looks like it should work” when you see such ingredient names is a natural response, but a growth factor label claim does not necessarily mean “this ingredient is present in an effective amount, retains its activity, and actually reaches the hair follicle.” In advertising language, “contains” is often a rather loose rule that lets manufacturers write the phrase as long as a single molecule is present in the package. From the standpoint of AVAN TOKYO Ginza’s hair regenerative medicine, which handles stem cell conditioned media, this column organizes three pitfalls patients should know when reading growth factor label claims, and lays out the distance between a cosmetic label and a medical-grade conditioned media.

Key Points of This Article

・A growth factor label claim is a marketing statement that can be cleared simply by writing “contains,” and it does not guarantee an effective dose.

・”Being contained” and “reaching the follicle and exerting activity” are separated by walls of molecular weight, the skin barrier, and degradation.

・Rather than relying on a growth factor label claim, the important stance is to verify the substance behind it through manufacturing registration, lot certificates of analysis, and route of administration.

・Cosmetics and medical-grade stem cell conditioned media regulated under Japan’s Act on the Safety of Regenerative Medicine may both invoke “growth factors,” but their review, manufacturing, and administration design differ at the foundation.

・When in doubt, the resolution of your expectations sharpens once you can choose between “apply and hope it penetrates” and “have it delivered around the follicle in a medical setting.”

Why Have Growth Factor Label Claims Multiplied So Much in Advertising?

There are two backgrounds. First, the word “regenerative medicine” has entered general vocabulary, and academic terms such as “EGF,” “FGF,” “IGF-1,” and “VEGF” have become everyday marketing language. Second, cosmetic ingredient-labeling rules are loose in the sense that “if it is contained, it can be written.” Unlike pharmaceuticals, cosmetics do not sit within a framework that guarantees efficacy, and disclosure of effective concentration, activity, or bioavailability is not obligated. As a result, a growth factor label claim only shows “it is present” and, in practice, circulates as a label that promises nothing about “it works.”

“Contained” and “Effective Amount” Do Not Mean the Same Thing

For example, even under the same “contains EGF” label, a product with a few nanograms of protein per mL and one with a few micrograms per mL can differ by hundreds to thousands of times in the amount that could actually act on tissue. Yet the label only says “contains,” so consumers cannot see this difference. Comparing products relying solely on a growth factor label claim, people tend to pick by “number of factors,” but from a hair-regeneration standpoint, “whether even a single factor is present in an effective amount” is far more important.

Three Pitfalls Easily Overlooked in a Growth Factor Label Claim

① “Contained” ≠ “Retaining Activity”

Growth factors are proteins. Proteins are prone to having their three-dimensional structure disrupted by temperature, pH, time, and preservatives, and once the structure collapses, they lose activity. For a product placed in a bottle and displayed at room temperature on a store shelf for a long period, we cannot rule out that some of the activity is already lost by the time it is opened. A growth factor label claim only points to “the fact that it was added at the time of manufacture” and does not guarantee “the activity at the moment you pick it up.”

② “Contained” ≠ “Reaches the Follicle”

The stratum corneum of the scalp is generally hard to traverse for molecules above 500 daltons. Meanwhile EGF is about 6,000, FGF is 17,000 to 30,000, and VEGF is around 40,000 — all far too large to breach the stratum corneum by topical application alone. In other words, simply applying a serum with a growth factor label claim to the scalp likely leaves most of the ingredient unable to reach the deep follicle and prone to degradation at the surface. Delivering it requires separate “means of crossing the barrier” — drug-delivery devices, microneedling, or injection.

③ “Contained” ≠ “Clinical Evidence of Hair-Growth Effect”

Basic-research data showing that an individual growth factor acted on hair follicles in vitro or in animal experiments and clinical evidence that a commercial product containing that factor made hair grow when applied by humans are entirely different tiers of information. A growth factor label claim may sit close to the former “possibility” but does not guarantee the backing of a peer-reviewed comparative trial demonstrating the latter “efficacy.”

Why Stem Cell Conditioned Media Used in Medical Settings Is Different From “Factor-Containing” Cosmetics

Stem cell conditioned media used in medical settings falls under the framework of registration, manufacturing, and quality control as a “specified cell-processed product” under Japan’s Act on the Safety of Regenerative Medicine. It passes sterility, mycoplasma, and endotoxin testing, and a lot-specific certificate of analysis (CoA) is issued, with source cells, manufacturing facility, and storage conditions all traceable. In addition, scalp administration is not “just applied” but is delivered via routes that cross the stratum-corneum barrier — through microneedle RF or injection technique. In other words, a growth factor label claim on a cosmetic can only indicate “the fact of being contained,” whereas medical conditioned media therapy attempts to control the three points of “effective amount,” “activity,” and “delivery” institutionally — a fundamentally different playing field. If you would like to browse related columns on hair regenerative medicine, please visit our list of hair regenerative medicine columns.

Practical “Growth Factor Label Claim Literacy” Patients Can Check on Their Own

In practice, it is useful to habitually check the following four points. First, beyond the growth factor label claim, is there a statement of “content per mL”? Second, is the origin of the growth factor (synthetic peptide, cell-culture supernatant, or animal-derived) clearly stated? Third, is the route of administration “application only,” or does it presuppose combination with microneedling, iontophoresis, or injection? Fourth, if it is handled at a medical facility, can you confirm the “registration number under the Act on the Safety of Regenerative Medicine” and the “registration number of the specified cell-processing facility”? Simply comparing these four points sharply raises the resolution of how far a growth factor label claim’s marketing wording is actually backed by substance. For clinical practice guidelines on alopecia including AGA, the information from the Japanese Dermatological Association is also a useful reference.

Frequently Asked Questions

Q. Is a product with more factors — “contains 5 types of EGF,” etc. — more advantageous for hair growth?

The number of factor types is only an indicator of “breadth of possibility” and does not directly signify efficacy. There are scenes in which one factor, delivered in clinically sufficient amount and activity around the follicle, is more meaningful than ten factors applied in trace amounts on the surface of the stratum corneum. It is important not to make the “number” in a growth factor label claim your only axis of comparison.

Q. If I apply an expensive factor-containing cosmetic every day, does it make medical conditioned media therapy unnecessary?

Cosmetics and medical-grade stem cell conditioned media differ at the foundation in review, manufacturing, quality control, and route of administration, so they are not simply interchangeable. At the stage where you need a design that crosses the scalp barrier and reaches around the follicle, it is reasonable to consider that cosmetics cannot substitute for it.

Q. If a label says “MHLW-approved” or “government-approved,” can I feel reassured?

Under Japan’s Medical Advertising Guidelines, expressions such as “MHLW-approved” or “government-approved” are prone to misperception. The Act on the Safety of Regenerative Medicine is basically a “notification-based” system, and “notification” is not the same as “approval.” Rather than taking label wording at face value, the recommended stance is to check the registration number and publicly disclosed protocol information.

Q. I have experienced side effects with a product bearing a growth factor label claim. Does medical conditioned media carry the same risk?

Itching, redness, and contact dermatitis can also arise from the compatibility with preservatives, fragrances, or vehicle bases. A past history of side effects is important information when considering medical-grade conditioned media as well, so please share it at your first consultation. Evaluation includes distinguishing whether the reaction was to the factor itself or to the vehicle.

Q. With medical conditioned media therapy, do I have to keep going forever, or things revert once I stop?

If we assume the physiological cycle called the hair cycle, once you break off after a single treatment and do no care afterward, you become passive against changes in the follicular environment driven by aging, hormones, and lifestyle. The need for continuation is designed individually from progression stage, age, lifestyle, and target image — it is neither “you must attend forever” nor “one session and done.”

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Medical Supervision: Dr. Shin Moriwaki (Supervising Physician)

Member, Japan Society of Aesthetic Surgery (JSAS)

Member, American Academy of Aesthetic Medicine

ECFMG Certificate

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