What should I ask before buying a hair loss product?

Who formulated it and can you verify they exist; whether the active is disclosed at a stated concentration; what tier of evidence exists; whether the study is on the ingredient or the finished product; and whether the photography is controlled.

What about the commercial terms?

Read the actual refund policy in its actual words, and the subscription cancellation terms. Those two clauses tell you a great deal about a brand's confidence.

Do these questions apply to MD Hair too?

Yes — explicitly. They are written to be used on any hair loss product, including ours.

12 Questions to Ask Before You Buy Any Hair Loss Product

2026年8月17日

By Dr. Susan Lin, MD | MD HAIR | La Cañada Ventures, Inc. — The Physician Behind MD HAIR Series

You have been looking at the same tab for twenty minutes. The photographs are persuasive. The reviews are five stars, thousands of them. There is a clinical-sounding word on the label and a graph with no axis labels. It costs more than you would like and less than you feared, and there is a countdown timer suggesting you decide now.

And underneath all of it is a question you cannot answer from the page in front of you: is this real, or is this just very good marketing?

I am going to give you the tools to answer that — and then I am going to do something most brands do not, which is run my own products through the same twelve questions and show you where our answers are strong and where they are not.

I should be clear about my position. I am a physician who formulates hair and scalp products. I am not a neutral party, and you should read everything below with that in mind. But I have spent nearly two decades on the manufacturing side of this industry, and I know exactly where the bodies are buried, because I have watched competitors bury them. The checklist below is the one I would give a family member. The self-audit that follows is the price of asking you to take the checklist seriously.

The 12 Questions

1. Who formulated this, and can you verify they exist?

Look for a named human being with verifiable credentials — a medical license you can check with a state board, a dermatology or trichology qualification, a publication record. Not "our team of scientists." Not a stock photograph in a white coat. Not a celebrity founder whose expertise is fame.

The tell is specificity: real credentials survive being looked up. If the "doctor" behind a brand has no findable license, no institution, and no history predating the product launch, you have learned something important.

2. Is the active ingredient disclosed at a stated concentration?

An ingredient list tells you what is present. It does not tell you how much. Ingredients are listed in descending order by weight down to 1%, below which they can appear in any order — which means a headline botanical can legally sit at 0.01% between two preservatives and still appear on the front of the box.

"Proprietary blend" is the phrase that should slow you down. It is sometimes legitimate trade-secret protection. It is also the standard hiding place for a formula that is mostly water and marketing. If a brand will not tell you the concentration of its hero active, you cannot evaluate it — and neither can your physician.

3. What evidence exists, and at what tier?

Test-tube and cell-culture studies. Useful for mechanism. Proof of nothing in a human.
Animal studies. A step up. Mouse hair biology differs meaningfully from human.
Consumer perception studies. Real people using a real product and reporting what they perceive. Genuinely informative about tolerability and satisfaction; not blinded, not placebo-controlled, and heavily influenced by expectation.
Instrumented open-label studies. Objective measurement — hair counts, shaft diameter, standardized photography — but with everyone knowing they are on the product.
Randomized, double-blind, placebo-controlled trials. The standard that separates a real effect from hope, regression to the mean, and the ordinary hair cycle.
Peer-reviewed publication. Independent experts examined the methods before anyone else saw the results.

Most of what is sold in this category rests on the first three tiers while borrowing the language of the last two. Ask which tier. Then ask whether you can read it.

4. Is the study on the ingredient, or on the finished product?

This is the most common sleight of hand in the industry, and it is almost invisible.

A brand cites an impressive trial of ingredient X. The trial used ingredient X at 5% in a specific vehicle, applied twice daily. The product contains ingredient X at an undisclosed fraction of a percent, in a completely different base, applied once. The citation is real. The implication is not.

Evidence for an ingredient is not evidence for a product. Concentration, vehicle, penetration, pH, stability, and contact time all determine whether an active reaches the follicle at all. Ask specifically: was this study done on the thing in the bottle?

5. Is the before-and-after photography controlled?

Uncontrolled photography can manufacture almost any result. The variables: lighting direction and warmth, wet versus dry hair, styling, part placement, camera angle and lens, head tilt, hair length, background contrast, and — most powerfully — hair color, since darker hair against pale scalp exaggerates thinning and the reverse conceals it.

Controlled photography means fixed distance and angle, standardized lighting, consistent styling, ideally a fixed head-positioning device. Legitimate studies describe their photographic protocol; marketing photographs do not, because there was not one. If the "after" also has a fresh cut and a blow-dry, you are looking at a hairdresser's work, not a formulator's.

6. What is the actual refund policy — in the actual words?

Read the policy page, not the badge. Is it a full refund or store credit? What is the window, and does it start at purchase or at delivery? Must the product be unopened — because a guarantee requiring unopened product is not a guarantee, given that hair takes months to respond? Who pays return shipping, and is there a restocking fee? Does it apply to subscription orders and to discounted or bundled purchases?

A "100% money-back guarantee" requiring unopened packaging returned within fourteen days at your expense is a marketing asset, not a consumer protection.

7. What are the subscription cancellation terms?

The most common consumer complaint in this category is not that a product failed. It is that the customer could not stop paying for it.

Find the cancel button before you need it. Can you cancel entirely online, in the same number of clicks it took to subscribe — or does it require a phone call during business hours, or notice a set number of days ahead? Is the introductory price a trial that converts to a much higher recurring charge? Is there a minimum commitment?

United States law is clear that cancellation should be simple and that recurring-charge terms must be clearly disclosed and affirmatively consented to before billing (Restore Online Shoppers' Confidence Act, 15 U.S.C. §§ 8401–8405). Compliance in practice varies enormously.

8. Is it drug-free, or does it contain a pharmaceutical you will need indefinitely?

This is a legitimate fork in the road, not a moral judgment. Pharmaceuticals in this category work — and they work conditionally, for as long as you use them.

Know which you are buying. A drug-containing product carries an implicit indefinite commitment, a discontinuation shed when you stop, a defined side-effect profile, and in most cases a hard contraindication in pregnancy and nursing. A cosmetic or supplement carries none of those, and also does not carry a drug's efficacy claims. Both are reasonable choices. Being unclear about which one is in your bathroom cabinet is not.

Related: watch for products that are sold like cosmetics but make drug claims. In United States law, what a product claims to do determines how it is regulated. A cream promising to "treat" or "cure" hair loss is asserting drug status — and if it has not been through drug approval, that claim is a regulatory violation, which tells you something about how the rest of the label was written.

9. Is it safe in pregnancy or while nursing?

Most brands avoid this question because the honest answer is uncomfortable. Pregnant and nursing women are, appropriately, excluded from nearly all cosmetic and supplement testing, which means for most products the truthful answer is we do not know.

"We do not know, so please ask your physician" is a good answer. "Completely safe and natural!" is a bad one, because natural is not a safety category — and the brand making that claim almost certainly has no data to support it. Be especially wary of botanical products marketed as pregnancy-safe by default. Several common hair botanicals have hormonal activity and are specifically cautioned against during pregnancy.

10. Who manufactures it, and to what standard?

Dietary supplements sold in the United States must be produced under 21 CFR Part 111, the current Good Manufacturing Practice regulation for dietary supplements, in facilities registered with the FDA. This governs identity testing, purity, contamination control, batch records, and label accuracy.

Two clarifications that the industry deliberately blurs:

"FDA-registered facility" is not "FDA approved." Registration means the FDA knows the facility exists and may inspect it. Under DSHEA, dietary supplements are not approved by the FDA before marketing, and neither are cosmetics. Any brand claiming its supplement or cosmetic is "FDA approved" is either confused or lying, and neither is reassuring.
Ask about third-party testing. Independent verification of identity, potency, and contaminants — heavy metals, microbes, adulterants — is the meaningful step beyond baseline compliance. Ask whether a certificate of analysis is available.

11. Are the reviews verified — and does the brand disclose what its product cannot do?

On reviews: look for verified-purchase markers, a plausible distribution (an authentic product has some three-star reviews; a perfect five-star wall is a red flag), varied rather than repeated phrasing, and a spread of dates rather than a cluster. United States advertising rules require that endorsements reflect honest opinions and that any material connection between reviewer and brand be disclosed (FTC Endorsement Guides, 16 CFR Part 255).

On limitations: does the brand ever tell you no? Does it say who this is not for, what results are realistic, how long it takes, or that some conditions need a physician instead of a product? A brand that has never published a limitation has never prioritized your outcome over the sale. This is the fastest single filter on the list.

12. Can you reach a human being?

Is there a real address? A working phone number or monitored email? A stated response time? Does support handle problems, or only orders?

Then test it: send a specific question — about an ingredient concentration, an interaction, a return — before you buy. The quality and honesty of that answer will tell you more than any page on the website. A brand that cannot be reached before it has your money will not become easier to reach afterward.

Now Apply All Twelve to MD HAIR

A checklist that conveniently exonerates its author is worthless. So here are our answers — including the ones I would rather not print.

1. Who formulated it? Dr. Susan F. Lin, M.D. — a licensed physician, verifiable through state medical board records, formulating hair and scalp products since 2008 under the MD® mark (U.S. Reg. No. 4,471,494), owned by La Cañada Ventures, Inc. My name, license, and history are attached to every product. Strong answer.

2. Concentration disclosure? This is our weakest answer, and I will not dress it up. We publish full ingredient lists, and I discuss the rationale and the literature behind our key actives openly. We do not publish the exact percentage of every active, because specific concentrations and ratios are the formulation work itself and are not protected any other way. That means you are, on this question, being asked to extend some trust — and by the standard I set in question 2, that is a real limitation of our transparency, not a technicality. I would rather name it than have you discover it.

3. Evidence tier? A 30-day in-office consumer use study of MD Nutri Hair™ in 30 subjects (95% saw improved hair appearance; 90% reported better manageability; 75% reported increased fullness — self-reported, no placebo control) and a 119-day Spincontrol North America study of the two-step topical serum system in 24 participants (71% agreed their hair growth had improved — self-reported, open-label, no placebo group, and the report notes the overall satisfaction rate was not significantly validated). Individual results vary. These are consumer-perception and open-label tiers — not randomized, double-blind, placebo-controlled trials, and not peer-reviewed publications. By the hierarchy in question 3, that places us in the middle of the ladder, not the top. Anyone in this category telling you they have pharmaceutical-grade trial evidence for a cosmetic or supplement is telling you something that is almost certainly untrue — but "everyone else is also mid-ladder" is an explanation, not an excuse. Honest answer, mid-tier evidence.

4. Ingredient study or finished product? Both, and the distinction matters. The Spincontrol study and the consumer use study were conducted on our finished products — that is finished-product evidence. The verbascoside science I write about is ingredient-level laboratory research: in controlled studies on human dermal papilla cells, the molecule induced cell proliferation, prevented testosterone-induced cell death, and reduced the release of pro-inflammatory signals. Those were cell studies, not human trials, the authors say clinical study is still needed, and the material tested came from Acanthus rather than lilac — same molecule, different plant, and not our own extract. It is mechanistic rationale for why the ingredient is in the formula. It is not clinical proof that our finished product produces regrowth, and I will not let it be read that way. I will add that we previously described this ingredient's laboratory profile in stronger terms than the primary literature supports; we checked the source, found it did not say what we had said, and rewrote it. That is question 4 applied to ourselves.

5. Controlled photography? The Spincontrol study used standardized protocols; that is the point of using an independent testing facility. Customer-submitted photographs on our site and on retail platforms are not controlled — different lighting, styling, and cameras — and should be read as customer experience, not evidence. Mixed answer, honestly labeled.

6. Refund policy? Here is our actual policy, in its actual terms: a standard return must be initiated within 30 calendar days of the ship date, and the product must be unused, unopened, factory sealed, and in its original packaging. Original shipping charges are generally nonrefundable, and return shipping is the customer's responsibility unless the return results from our shipping error or a verified defect. Judged by the standard I set in question 6 — that hair takes months to respond, so an unopened-only window is a returns policy rather than a try-it guarantee — that is a returns policy, and I am going to call it what it is rather than dress it up. The full policy page states the complete and controlling terms, including how subscription shipments are handled; read it before you buy, exactly as question 6 instructs.

7. Subscription terms? On mdhair.com, subscriptions are managed online through your account portal — skip, pause, or cancel yourself, without a phone call. Our Terms state it plainly: "You may cancel at any time with no cancellation fee" — and there is no minimum commitment. Subscriptions through the official Amazon and Walmart stores are managed in those platforms' own subscription settings. Strong answer — and if you ever find the cancellation path harder than the signup path, tell us, because that is the failure question 7 exists to catch.

8. Drug-free? Yes, unambiguously. MD HAIR™ and MD Nutri Hair™ are cosmetics and dietary supplements — no minoxidil, no finasteride, no hormones. There is no discontinuation shed, no indefinite pharmaceutical commitment, and they can be used alongside a prescribed treatment. The corresponding honest trade-off: we also do not carry a drug's efficacy claims, because we are not a drug. These products are not intended to diagnose, treat, cure, or prevent any disease. Strong answer, with the trade-off stated.

9. Pregnancy and nursing? Our honest answer is the one I told you to look for: we do not have pregnancy or lactation safety data, because such studies are not conducted on cosmetics and supplements — and for that reason we do not advocate using MD HAIR products during pregnancy or lactation. Review any product — ours included — with your obstetrician or physician first. Honest answer; the answer is "no data, so we don't advocate it," not "yes."

10. Manufacturing? Made in the USA in FDA-registered, GMP-compliant facilities. To be explicit about the distinction I insisted on in question 10: that describes the manufacturing standard. It does not mean FDA approved. Neither our supplements nor our cosmetics are FDA approved, and no supplement or cosmetic on the market is. Strong answer, correctly scoped.

11. Verified reviews and disclosed limitations? Reviews on Amazon and Walmart carry those platforms' verified-purchase mechanisms. On our own site, moderation is our responsibility, which by the standard of question 11 is inherently less independent — worth knowing. On counterfeits: because we cannot verify products sold through unauthorized channels, reviews of those units may not reflect our actual product. On limitations: this article is itself the answer, alongside the drug-free trade-off in item 8, the pregnancy answer in item 9, and every piece in this series where I have written that a supplement cannot substitute for a diagnosis, that no product reverses an acute shed, and that iron and vitamin D require testing rather than guessing. Mixed on reviews, strong on limitations.

12. Reach a human? La Cañada Ventures, Inc. publishes its contact details: customercare@mdhair.com and (650) 340-8688, Monday–Friday, 10am–5pm Pacific. Support is intended to answer formulation and suitability questions, not just process orders — and I encourage you to run the question-12 test on us before you buy. Strong answer — and testable.

Scorecard, honestly: strong on questions 1, 7, 8, 9, 10, and 12; strong-with-caveats on 3, 4, 5, and 11; weakest on question 2 (concentration disclosure) and candidly mid on question 6, where our standard policy is a returns policy rather than a try-it guarantee. If either is the deciding factor for you, that is a legitimate reason to choose something else, and I would rather you make that choice with accurate information than buy from us on a misunderstanding.

The Bottom Line

The hair loss market runs on urgency and asymmetry: you are frightened, you are not a formulator, and the people selling to you know both. Twelve questions dissolve most of that asymmetry, and you can ask them in the time it takes to read a product page.

Who made this, and can I verify them? What is in it, and how much? What evidence exists, at what tier, and on the ingredient or the product? Are the photographs controlled? Can I get my money back, and can I stop the recurring charge? Is it a drug or not? Is it safe for my situation? Who manufactures it, to what standard? Are the reviews real? Does this brand ever admit what it cannot do? Can I reach a person?

You will not find a product that answers all twelve perfectly, including mine. That is not the goal. The goal is that you know which answers you are accepting, and why — and that any brand asking for your trust is willing to be specific in public about where it falls short. The brands that pass are not the ones with the best marketing. They are the ones still standing when you stop reading the headline and start reading the policy page.

Dr. Susan Lin's Clinical Perspective

"The imbalance in this market is not primarily about efficacy — it is about information. Patients arrive frightened and shopping, and the industry is structured so that the least verifiable claims are the loudest ones. What I want a patient to internalize is that the questions requiring the least expertise are the most diagnostic: can you find the formulator, can you find the concentration, can you cancel the subscription, and has this brand ever published a limitation. A company that answers those four plainly is usually honest about the harder ones. I ran my own products through this list knowing in advance that our concentration disclosure would come out as the weak answer, and I published it that way — because a checklist that conveniently exonerates its author has taught the reader nothing, and because I would rather lose a sale than earn one on a misunderstanding."

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

Mechanism Spotlight: Why an Ingredient Study Rarely Transfers to a Finished Product

Question 4 is the most technical item on the checklist, so it is worth explaining the biology that makes it decisive.

A topical active has to cross the stratum corneum — a dense, lipid-rich barrier of dead keratinocytes evolved specifically to keep foreign molecules out. The dominant constraint is size: the 500 Dalton rule observes that molecules above roughly 500 Da penetrate intact skin very poorly, which is why nearly all common topical drugs fall below that threshold (Bos & Meinardi, 2000). Many impressive botanical actives are considerably larger — and a molecule that performs beautifully applied directly to cultured dermal papilla cells in a dish has, in that experiment, skipped the barrier entirely.

Penetration is then modulated by the vehicle: solvent polarity, lipid content, penetration enhancers, pH, and whether the base evaporates or forms an occlusive film. The identical active at the identical concentration in two different bases can deliver entirely differently to the follicle. Contact time matters just as much, which is why a rinse-off product and a leave-on serum containing the same ingredient are not comparable. And concentration and stability matter again on top of that: many actives are studied at percentages far above cosmetic use levels, and polyphenols in particular oxidize with light, air, and time, so what was in the study may not be what remains in a bottle six months into shelf life.

This is why "was the study done on the finished product?" is not pedantry. It is the difference between evidence and inference. A brand citing ingredient-level research is telling you why it made a formulation choice — legitimate and useful. A brand implying that ingredient-level research proves its product works is asking you to skip four independent variables, every one of which can reduce a real effect to nothing.

MD HAIR Product Recommendation

I am not going to close a consumer-protection article by selling you something. That would undercut the whole point.

Instead, two pages — both of which exist so you can apply the checklist to us rather than take my word for anything:

The Clinical Evidence Behind MD HAIR — our studies, what tier they sit at, what they measured, and what they do not establish. Read it against questions 3, 4, and 5 and judge for yourself.

The MD HAIR Quiz — a structured way to work out what is actually driving your hair loss, including the outcomes where the honest answer is that you need a physician and a lab panel rather than any product, ours included.

If you decide MD HAIR is right for you, our products are drug-free, hormone-free, formulated by Dr. Susan F. Lin, M.D. under the MD® mark (U.S. Reg. No. 4,471,494) — physician-formulated since 2008 — and made in the USA in FDA-registered, GMP-compliant facilities by La Cañada Ventures, Inc. They are cosmetics and dietary supplements, not drugs, and are not intended to diagnose, treat, cure, or prevent any disease. Individual results vary.

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 stores on Amazon and Walmart. We cannot verify the storage, handling, or authenticity of products bought anywhere else — which is, itself, question 11 applied to us.

References (click to check)

Dr. Susan F. Lin, M.D. is the physician formulator behind MD HAIR, a line of drug-free hair and scalp products by La Cañada Ventures, Inc., physician-formulated since 2008 under the MD® mark (U.S. Reg. No. 4,471,494). MD HAIR products are cosmetics and dietary supplements; they are not intended to diagnose, treat, cure, or prevent any disease, and they are not FDA approved — no cosmetic or dietary supplement is. This article is for educational purposes and does not constitute medical advice. Do not start, stop, or change any prescribed medication without consulting your own physician. Individual results vary.

Pregnancy and breastfeeding: because there are no clinical data in pregnant or breastfeeding women, we do not advocate using MD HAIR products during pregnancy or lactation.

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.