Do Plant Stem Cells Work in Hair Products? Read the Label

By Dr. Susan Lin, MD | MD HAIR | La Cañada Ventures, Inc.
Published on mdhair.com — Verbascoside & Lilac Science Series

You have read the phrase a hundred times by now. Plant stem cells. It appears on serums, shampoos, capsules and creams, usually in a slightly futuristic typeface, usually beside a photograph of a leaf backlit in a laboratory. And you have never once been told what it means, because the phrase is doing marketing work rather than descriptive work.

So let me strip it down, and then do something more useful with the remains.

Plant cell culture is a real laboratory technology. It is decades old, it is unglamorous, and it works. It involves no human cells, no animal cells, no embryos, and nothing that will activate the stem cells in your scalp. It is a way of growing plant cells in a controlled vessel instead of harvesting plants from a field. And its genuine value is not that it makes an ingredient more powerful. It is that it makes an ingredient the same every time.

That is a much duller claim, and I would like to persuade you it is the more important one.

I am Dr. Susan F. Lin, M.D. — Boston University School of Medicine, board-certified in Obstetrics & Gynecology and in Anti-Aging Medicine, and the physician who has formulated the MD® line at La Cañada Ventures, Inc. since 2008. This article is about how to read a botanical label. At the end I apply the same standard to my own product, including the place where it does not measure up.

What Plant Stem Cell Actually Denotes

There is no regulatory definition of the phrase, which is the first thing worth knowing. In technical practice it refers to dedifferentiated plant cells grown in culture.

The process, without romance:

  1. A small piece of plant tissue — an explant, often a leaf fragment — is taken under sterile conditions.
  2. On a nutrient medium with appropriate plant growth regulators, the cells at the cut surface dedifferentiate: they revert from specialised leaf cells into an undifferentiated mass called callus. This is the plant's ordinary wound-healing behaviour, harnessed.
  3. Callus is transferred into liquid medium as a cell suspension, and from there into a bioreactor where temperature, pH, oxygen, nutrients and light are held constant.
  4. Biomass is harvested, dried and extracted. The result is the ingredient.

That is it. It is a manufacturing method. The published literature treats it as such: plant cell culture is reviewed as a production platform for cosmetic active ingredients (Barbulova et al., 2014), as a bioprocessing route for mass production of targeted compounds (Georgiev et al., 2009), and as an established technology in the cosmetics and food industries with a defined current state and identifiable limitations (Eibl et al., 2018).

What it is not:

  • It is not a stem-cell therapy. A plant cell cannot integrate into human tissue, and nothing in a topical or a capsule delivers a living cell to your follicle.
  • It is not plant stem cells that activate your stem cells. That sentence is a pun wearing a lab coat.
  • It is not automatically superior. A cell-culture ingredient with no assay is worth no more than a field-harvested one with no assay.

The technology's advantage is upstream of any of that, and it is best understood by looking at the problem it solves.

The Problem: A Plant Name on a Label Tells You Almost Nothing

Here is the uncomfortable core of botanical formulation. Suppose a label says lilac extract. What have you learned?

You have not learned the species or plant part. Syringa vulgaris leaf and Syringa flower are different material with different chemistry. Root, leaf, bark and fruit of the same plant routinely differ by an order of magnitude in the compound of interest.

You have not learned the chemotype or the growing conditions. The secondary-metabolite content of field-grown plant material varies with cultivar, soil, altitude, rainfall, sun exposure, season, harvest timing, drying and storage. These are not small effects. Plants make defensive compounds in response to stress, so a dry year and a wet year produce genuinely different material from the same field.

You have not learned the extraction. Water, ethanol, hydroalcoholic and supercritical CO₂ extraction of the same biomass yield different compositions. Extract describes no ratio, no solvent and no concentration.

You have not learned that the plant in the jar is the plant on the label. This is not hypothetical. DNA barcoding of North American herbal products found substantial rates of substitution, contamination and undeclared filler across sampled products (Newmaster et al., 2013). The ethnopharmacology literature has examined why: herbal value chains are long, multi-country and poorly traceable, and material changes hands several times between field and finished good (Booker et al., 2012).

And you have not learned how much of anything is in there. This is the one that matters most, and the one almost no label answers.

Put those together and lilac extract on a panel is, on its own, close to information-free. It tells you a plant was involved.

Standardization: The Only Answer to That Problem

Standardization means the material is manufactured and released against a measured content of a named molecule, by a named analytical method, within a defined range.

Three components, all required. A named molecule — not polyphenols or actives. A named method — HPLC, UPLC, LC-MS/MS, with the assay specified. A defined range — a floor and a ceiling, not a single aspirational number.

If any of the three is missing, the word standardized on a label is decorative.

The worked example: DC2581N

I would rather show you a real specification than describe one in the abstract, so here is the one behind our lilac ingredient.

Phytostem VitaFoods Lilac Dry 50N, product code DC2581N, Resources of Nature LLC, revision 07/13/2011. A Syringa vulgaris leaf cell culture extract on a maltodextrin carrier, designated for nutritional use.

Parameter Specification Method
Verbascoside content 47.5 – 52.5% w/w HPLC
Total microbial count < 1000 cfu/g —
Arsenic < 10.0 ppm —
Cadmium < 10.0 ppm —
Mercury < 10.0 ppm —
Lead < 10.0 ppm —

Read the first row carefully, because it is the whole argument of this article compressed into eleven characters.

It names the molecule: verbascoside. It names the method: HPLC. And it gives a range — 47.5 to 52.5% by weight. That is a nominal 50% with a ±2.5 percentage-point band, which is a ±5% relative tolerance.

That band is the product. Not the 50%. The narrowness.

It means that when I formulate to a target amount of verbascoside, the material arriving next spring will contain what the material arriving today contains, within five percent relative. Every downstream statement I make about that molecule is anchored to a number somebody measured on an instrument, on that lot, against that specification.

Compare it to the alternative. A wild-harvested lilac extract with no assay has no band at all. It might be 8% verbascoside. It might be 0.4%. Nobody involved knows, because nobody measured, and — this is the part that should bother you — nobody can tell the difference by looking, smelling or pricing it.

Why the potency framing is a trap

The industry sells on the wrong axis. Labels compete on bigger numbers: higher milligrams, higher multiples, 10× stronger, maximum strength.

Think about what a large unverified number actually is. It is a claim about the average of a distribution whose variance is unknown. And a number you cannot reproduce is not a dose — it is an anecdote about one batch, and quite possibly about no batch at all.

Three reasons standardization dominates potency:

1. Reproducibility is a precondition for evidence. Any research on an ingredient, including the laboratory research on verbascoside, was performed on defined material at defined concentrations. If your material's content swings between lots, you cannot claim any relationship to that research, because you are not reliably delivering the thing that was studied.

2. Reproducibility is a precondition for safety. Toxicological assessment is dose-based. Uncontrolled content is uncontrolled dose in both directions.

3. Reproducibility is what makes your own experience interpretable. If you take something for six months and think it helped, that observation only means something if the capsule in month six was the capsule in month one. Consistency is what turns your own use into information rather than noise.

The right question to ask a brand is not how much. It is what molecule, measured by what method, to what range? If the answer is a species name and an adjective, you have your answer.

Two Claims I Will Not Make — Including One We Got Wrong

A standard is worth nothing if it is only applied to other people.

The ORAC claim. We wrote it, it was wrong, and it is gone. Our supplier's literature states that the cell-culture process yields up to 1000 times the active molecule concentration compared with standard botanical extraction methods. That is a statement about manufacturing yield of a target compound relative to conventional extraction. Somewhere in our copy it became ORAC roughly 1,000× higher per gram than common fruits — an antioxidant capacity claim, benchmarked against foods. Those are different statements about different quantities, and the transformation from one to the other was not a rounding error, it was a category error. It has been removed everywhere we control.

There is a second reason not to resurrect it in any form: ORAC is not a claim I would make even if the number were right. The USDA withdrew its ORAC database in 2012, citing misuse of the values by the supplement and food industries and the absence of evidence that in-vitro antioxidant capacity predicts anything in humans (USDA ARS). A test-tube antioxidant score is not a biological outcome.

The enzyme claim. Same discipline, larger consequence. Our copy once described verbascoside as having been studied for an interaction with 5-alpha-reductase. We held a supplier slide deck that said so and cited a real pharmacology paper. When we opened that paper, it never mentioned verbascoside, acteoside, lilac or Syringa — it tested two smaller molecules that are structural fragments of verbascoside, and its actual finding pointed toward selectivity for a single form of the enzyme rather than broad activity. The claim was unsupported, so it is gone from every page we control, and it is not coming back.

I put both of these in an article about standards because they are the same failure: a document in the supply chain is not evidence. The paper it cites is the evidence, and the two can say different things. That is true of our documents as much as anyone's.

What Standardization Does Not Buy You

Every honest standard states its own limits. Here are four.

It is not efficacy. A specification sheet tells you what is in the material. It says nothing about whether that material does anything. Ours is the same: the published verbascoside research is laboratory research on human dermal papilla cells, and the authors themselves state that clinical study is still needed (Wisuitiprot et al., 2022).

It is not bioavailability. Knowing a capsule contains a defined amount of a molecule tells you nothing about what fraction of it is absorbed, or reaches the tissue in question. We do not hold bioavailability data for our oral ingredients, so we make no absorption claims. If such data exists, it will be read before any claim is built on it, not after.

It is not shelf-life potency. MD Nutri Hair™ has been through an accelerated stability programme with microbiological analysis at 0, 1, 2, 3 and 6 months per USP General Chapters <2021> and <2022> (Health Level One Inc., Hauppauge NY, lot 15294). That is microbiological quality over storage. It is not an assay of verbascoside content across shelf life, and anyone describing it simply as stability tested — including us, if we ever have — has overstated it by a category. Polyphenols oxidise with light, air and time, which is exactly why the distinction is substantive rather than pedantic.

It is not a raw-material claim you may transfer to the finished product. Which brings me to the uncomfortable paragraph.

Applying the Standard to My Own Product

Here is where MD Nutri Hair™ passes and where it does not.

Where it passes.

The raw material is assayed against a written specification — DC2581N, verbascoside 47.5–52.5% w/w by HPLC, with heavy-metal and microbial limits, from a named supplier at a named revision date. The Syringa vulgaris material also carries a genuine ingredient safety dossier, each study with a named laboratory, report number and date: acute oral toxicity to OECD 420 (GHS Category 5/NC — no toxic symptoms or signs; Biolab Spa, Vimodrone, report SAM2075, 15/06/2004); bacterial reverse mutation to OECD 471, non-mutagenic with and without metabolic activation (Biolab Spa, SAM4014, 30/05/2007); in vitro ocular irritation by MTT on reconstituted human corneal epithelium (SkinEthic), non-irritating, Draize score 0 (Biolab, Milan, May 2007); and a 20-subject patch test with an average irritation index below 0.5 (Kalibios, Rome, 07-77/04-05, October 2007). Those are ingredient safety findings, not efficacy findings, and they do not extend to the finished formulation.

Where it does not.

MD Nutri Hair™ declares a Proprietary Blend of 300 mg. The individual amounts of flaxseed powder, lignan powder and lilac inside that 300 mg are not disclosed on the label.

Which means that everything I have just written about assayed content applies rigorously to the material we buy, and stops at the capsule. You can verify the concentration of verbascoside in the extract. You cannot, from the label, determine how many milligrams of that extract are in one capsule.

Proprietary blends are lawful. They are ubiquitous. And by the standard this article sets out, that is our weakest answer, and I am not going to soften it or bury it below a testimonial. If you have been reading this page as an argument for why our transparency is better than someone else's, this paragraph is the correction: our ingredient transparency is good and documented; our formulation transparency is average for the category, and average is not what I want it to be.

The rest of the label, for completeness: one capsule daily, adults only. Niacinamide 5 mg, alpha tocopheryl acetate (vitamin E) 5 mg, D-biotin 0.05 mg. Other ingredients: flaxseed powder, lignan powder, lilac. Per the product label: do not take if you are pregnant or breast feeding.

The Bottom Line

Plant stem cells denotes plant cell culture — dedifferentiated plant cells grown in a bioreactor under controlled conditions — a legitimate, decades-old production technology used across cosmetics and food (Barbulova et al., 2014; Georgiev et al., 2009; Eibl et al., 2018). It involves no human or animal cells and it does nothing to your own stem cells. Its real value is batch-to-batch reproducibility, which matters because a plant name on a label tells you almost nothing: species, plant part, chemotype, growing conditions, extraction solvent and actual content all vary, and substitution and contamination in herbal supply chains are documented rather than theoretical (Newmaster et al., 2013; Booker et al., 2012). The answer is standardization: a named molecule, a named method, a defined range — for our lilac material, verbascoside at 47.5–52.5% w/w by HPLC under specification DC2581N. The narrowness of that band is the product, not the 50%. Standardization is not efficacy, not bioavailability, not shelf-life potency, and not transferable to a finished capsule — and MD Nutri Hair™ declares a 300 mg proprietary blend, so the amount of that assayed extract per capsule is undisclosed. Ask any brand the same three questions: what molecule, measured how, to what range. Most cannot answer. The answer is more informative than any number on the front of the box.

Dr. Susan Lin's Clinical Perspective

"In medicine, the unit of trust is reproducibility. A blood test is useful because the same sample run twice gives the same answer; that is what makes a result a fact rather than an impression. Moving from clinical practice into formulation, what startled me was how much of the botanical world runs without that. Suppliers would offer me an extract with a beautiful story and no assay, and seem puzzled that I wanted a number. So I set a rule early: if I cannot name the molecule, the method and the range, I will not build a claim on the material. It has ruled out ingredients I liked. It also means that when I describe what is in our formula, I am describing something somebody measured on an instrument — and I can show you the specification."

— Dr. Susan F. Lin, M.D., Physician Formulator, MD HAIR

Mechanism Spotlight: Why a Bioreactor Produces a Narrow Band and a Field Cannot

The reason cell culture achieves a ±5% relative tolerance and field harvest does not is not effort. It is the number of uncontrolled variables.

A field-grown lilac experiences an unrepeatable combination of soil chemistry, rainfall, temperature, sunlight hours, pest pressure and harvest date. Secondary metabolites like verbascoside are stress-responsive defence compounds — the plant makes more or less of them according to what the season did to it (Alipieva et al., 2014; Korkina, 2007). The content of a harvest is therefore a downstream reading of a year's weather. Nobody controls that, and nobody can repeat it.

A bioreactor removes those variables rather than compensating for them. Cell line, inoculum density, medium composition, growth regulators, temperature, pH, dissolved oxygen, agitation and harvest timing are set points, held by instrumentation and recorded batch by batch. The culture takes its carbon from the medium, so seasonal light is irrelevant. The vessel is closed, and pesticide inputs are absent by construction — which is also why the heavy-metal and microbial limits on the DC2581N sheet are specifiable at all: the inputs are defined rather than inherited from soil.

The literature describes the trade honestly. Plant cell culture is capital-intensive and is not a route to every compound, but for defined secondary metabolites it delivers reproducible, traceable production independent of season and geography (Georgiev et al., 2009; Eibl et al., 2018).

You are not paying for a more powerful molecule. You are paying for a smaller standard deviation.

Recommended Reading

Pillar pages on mdhair.com:

Related articles in this series:

Our sister site md-factor.com carries the wider MD® portfolio, documented to this same standard.

MD HAIR Product Recommendation

MD Nutri Hair™ — /products/nutri-hair-supplement

Why I am recommending it here, and precisely how far the recommendation goes. This article argues that the question worth asking a botanical brand is what molecule, measured by what method, to what range. MD Nutri Hair™ is the product in our line where I can answer all three: verbascoside, by HPLC, at 47.5–52.5% w/w, under specification DC2581N from Resources of Nature LLC — a Syringa vulgaris leaf cell culture extract with defined heavy-metal and microbial limits, backed by an ingredient safety dossier with named laboratories, report numbers and dates.

The mechanism sentence, kept inside the evidence. In laboratory studies on human dermal papilla cells, verbascoside reduced the release of pro-inflammatory signals including IL-1α, IL-6, IL-1β and TNF-α, and prevented testosterone-induced death of those cells (Wisuitiprot et al., 2022). Cell studies, not clinical trials; verbascoside sourced from Acanthus rather than lilac; the authors state clinical study is still needed. We make no claim that verbascoside inhibits 5-alpha-reductase.

And the limits of the recommendation, since this is that kind of article. The 47.5–52.5% figure is a raw-material specification, not a statement about the capsule. The capsule declares a 300 mg proprietary blend, so the amount of that extract per serving is undisclosed. We hold no bioavailability data and no potency-stability data. If you want a supplement whose every milligram is on the panel, this one does not meet that test today, and I would rather you buy on an accurate picture than a flattering one.

If you are not yet sure what is driving your hair change, buy nothing and start with the MD HAIR Quiz — several outcomes route to a physician and a laboratory panel rather than to any product of ours.

A note on authenticity: genuine MD HAIR™ and MD Nutri Hair™ products are sold only through mdhair.com, md-factor.com, and the official La Cañada Ventures, Inc. stores on Amazon and Walmart. Specifications, lot numbers and laboratory reports referenced here belong to material we sourced and product we manufactured; for a unit bought elsewhere we cannot verify the lot, the storage or the handling, which means none of this documentation applies to it.

References

  1. Barbulova A, Apone F, Colucci G. (2014). Plant cell cultures as source of cosmetic active ingredients. Cosmetics, 1(2), 94–104. doi:10.3390/cosmetics1020094
  2. Eibl R, Meier P, Stutz I, Schildberger D, Hühn T, Eibl D. (2018). Plant cell culture technology in the cosmetics and food industries: current state and future trends. Applied Microbiology and Biotechnology, 102(20), 8661–8675. PMID 30099571
  3. Georgiev MI, Weber J, Maciuk A. (2009). Bioprocessing of plant cell cultures for mass production of targeted compounds. Applied Microbiology and Biotechnology, 83(5), 809–823. PMID 19488748
  4. Alipieva K, Korkina L, Orhan IE, Georgiev MI. (2014). Verbascoside — a review of its occurrence, (bio)synthesis and pharmacological significance. Biotechnology Advances, 32(6), 1065–1076. PMID 25048704
  5. Vertuani S, Beghelli E, Scalambra E, et al. (2011). Activity and stability studies of verbascoside, a novel antioxidant, in dermo-cosmetic and pharmaceutical topical formulations. Molecules, 16(8), 7068–7080. PMID 21852765
  6. Korkina LG. (2007). Phenylpropanoids as naturally occurring antioxidants: from plant defense to human health. Cellular and Molecular Biology, 53(1), 15–25. PMID 17519109
  7. Newmaster SG, Grguric M, Shanmughanandhan D, Ramalingam S, Ragupathy S. (2013). DNA barcoding detects contamination and substitution in North American herbal products. BMC Medicine, 11, 222. PMID 24120035
  8. Booker A, Johnston D, Heinrich M. (2012). Value chains of herbal medicines — research needs and key challenges in the context of ethnopharmacology. Journal of Ethnopharmacology, 140(3), 624–633. PMID 22326378
  9. Wisuitiprot V, Ingkaninan K, Chakkavittumrong P, et al. (2022). Effects of Acanthus ebracteatus Vahl. extract and verbascoside on human dermal papilla and murine macrophage. Scientific Reports, 12(1), 1491. PMID 35087085 · open access
  10. 21 CFR § 101.36 — Nutrition labeling of dietary supplements, including the Supplement Facts panel and the proprietary blend declaration. eCFR
  11. OECD. Test No. 420: Acute Oral Toxicity — Fixed Dose Procedure. OECD Guidelines for the Testing of Chemicals, Section 4. oecd.org
  12. OECD. Test No. 471: Bacterial Reverse Mutation Test. OECD Guidelines for the Testing of Chemicals, Section 4. oecd.org
  13. United States Pharmacopeia, General Chapter <2021> Microbial Enumeration Tests — Nutritional and Dietary Supplements (USP-NF) and General Chapter <2022> Microbiological Procedures for Absence of Specified Microorganisms — Nutritional and Dietary Supplements.
  14. U.S. Department of Agriculture, Agricultural Research Service. Withdrawal of the USDA Oxygen Radical Absorbance Capacity (ORAC) Database for Selected Foods, 2012. USDA ARS
  15. Phytostem VitaFoods Lilac Dry 50N raw-material specification, product code DC2581N, Resources of Nature LLC, revision 07/13/2011 — Syringa vulgaris leaf cell culture extract, maltodextrin excipient, for nutritional use; verbascoside 47.5–52.5% w/w by HPLC; total microbial count < 1000 cfu/g; arsenic, cadmium, mercury and lead each < 10.0 ppm. Internal document, on file.
  16. Ingredient safety dossier, Syringa vulgaris / verbascoside: Biolab Spa, Vimodrone (MI), Italy — report SAM2075, 15/06/2004 (acute oral toxicity, OECD 420) and report SAM4014, 30/05/2007 (bacterial reverse mutation, OECD 471); Biolab, Milan — May 2007 (MTT on reconstituted human corneal epithelium, SkinEthic); Kalibios, Rome — report 07-77/04-05, October 2007 (20-subject patch test). Internal documents, on file.
  17. Health Level One Inc., Hauppauge, NY — accelerated microbiological stability set for MD Nutri Hair™, lot 15294, timepoints 0/1/2/3/6 months per USP <2021> and <2022>; laboratory controls MB331216 / CH2281116. Internal documents, on file.
  18. MD Nutri Hair™ box artwork, June 2016 — Supplement Facts panel, Other Ingredients and label warnings, as quoted. Internal document, on file.

Dr. Susan F. Lin, M.D. is the physician formulator behind MD HAIR and MD Nutri Hair™, product lines of La Cañada Ventures, Inc. — physician-formulated since 2008 under the MD® mark (U.S. Reg. No. 4,471,494). She trained at Boston University School of Medicine and is board-certified in Obstetrics & Gynecology and in Anti-Aging Medicine (A4M).

This article is for educational purposes and does not constitute medical advice. Consult your own physician for personalized guidance.

MD® products are cosmetics and dietary supplements manufactured in FDA-registered, GMP-compliant facilities. "FDA-registered" describes the facility, never the product: no MD product is FDA approved, and no cosmetic or dietary supplement is. Individual results vary. MD Nutri Hair™ is a dietary supplement. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

MD Nutri Hair™ is for adults only, one capsule daily. Per the product label: do not take if you are pregnant or breast feeding. Because there are no clinical data in pregnant or breastfeeding women, we do not advocate using MD HAIR products during pregnancy or lactation.

The specification, safety and stability findings described in this article relate to ingredient identity, purity, safety and microbiological quality. They are not efficacy findings and are not presented as such. Laboratory findings on verbascoside were obtained in cell culture.

Explore more in the Verbascoside & Lilac Science series at mdhair.com/pages/lilac-verbascoside-science