Hair Supplements: A Guide

Why Your Hair Is Falling Out: Understanding Hair Loss to Better Combat It

Before you jump at the first product you see, it’s worth taking a quick detour into biology. Hair is composed of 95% keratin, a protein produced by the hair bulb from sulfur-containing amino acids (cysteine, methionine) and B vitamins. When the hair bulb lacks “raw materials,” the hair shaft becomes thinner, weaker, and eventually falls out. Three main mechanisms explain hair loss:

• Nutritional factors: deficiencies in iron, zinc, vitamin B8, or protein. A balanced diet is the first line of defense.
• The hormonal pathway: in women over 35, declining estrogen levels and overactive 5-alpha reductase can cause hair follicles to shrink.
• The vascular pathway: Impaired microcirculation in the scalp reduces the supply of oxygen and essential nutrients to the hair bulb.

An effective hair supplement ideally targets at least two of these three pathways. And that’s where the sorting begins.

Vitamin B8, zinc, iron: hair care ingredients under the microscope

Let’s take a closer look at the ingredients found in most hair and nail care products. Which ones actually deliver on their promises?

Vitamin B8: Beneficial, but Not for Everyone

Biotin is a coenzyme involved in the formation of keratin. European health authorities recognize that it helps maintain healthy hair, provided the formula contains at least 7.5 micrograms per serving. However, the scientific literature casts considerable doubt on its effectiveness. It indicates that statistically, This vitamin has no real effect on healthy people who are not deficient in it. Only people with metabolic disorders that affect its utilization would see a measurable benefit for their hair and nails. The recommended daily dose is approximately 30 to 40 µg/day for adults. A diet that includes eggs, salmon, nuts, and whole grains generally meets these needs. Biotin deficiency remains very rare in countries with a varied diet.

Zinc: A Reliable Ally

Zinc protects cells from oxidative stress and plays a role in protein synthesis, including the protein that makes up hair fibers. A deficiency can weaken the cuticle and cause visible thinning. The main dietary sources are spinach, oysters, and legumes. As a supplement, this trace element helps maintain normal hair and nails: it is one of the few whose health claim is validated at the European level.

Vitamin B6: The Link to Hair Protein

Vitamin B6 contributes to the normal synthesis of cysteine, a sulfur-containing amino acid essential for hair growth. It plays a role in the metabolism of the hair’s structural proteins. It is an often-overlooked yet essential component in formulations.

Brewer's yeast and sulfur-containing amino acids: watch out for marketing hype

Brewer's yeast is rich in B vitamins and protein. Its nutritional benefits are undeniable. However, European health authorities have concluded that formulas containing brewer's yeast cannot claim to contribute to the health of hair or nails. Similarly, there is no evidence that cysteine and methionine are effective in people who are not deficient. In other words: if you’re eating a balanced diet, these ingredients probably won’t make a difference.

Omega-7 vs. Biotin: The Showdown Nobody Told You About

Now that you know the limitations of vitamin B8, let’s talk about a fatty acid that’s much less talked about, yet deserves your full attention: omega-7, or palmitoleic acid. Omega-7 is a lipid with a structure very similar to human sebum. Only four fruits in the world contain it in significant amounts, and sea buckthorn has a concentration at least 20 times higher than other sources. Why is this relevant for your hair?

• Stimulation of hair protein: By nourishing the hair follicles and regulating the scalp’s hydrolipidic film, omega-7 creates an environment conducive to keratin production, which makes up 95% of the hair shaft.
• Sebum regulation: Too much sebum can suffocate the hair bulb. Too little can cause the hair to break. Omega-7 acts as a natural sebum regulator, promoting a healthy environment for the hair root.
• Anti-inflammatory action: Scalp inflammation is one of the factors contributing to hair loss. Palmitoleic acid has well-documented anti-inflammatory properties.

While vitamin B8 has been shown to be effective only in cases of proven deficiency, omega-7 works on the hair’s overall environment: nourishing the hair bulb, regulating sebum, and protecting the hair shaft. It’s a complementary approach, and frankly, often more effective than traditional supplementation for women who already have a varied diet.

How to Read the Ingredients List on a Hair Supplement

Want to check before you buy? Great—here’s what to look for when you see a label at the pharmacy:

• Formula length: A long list of ingredients (15 or 20 items) is rarely a good sign. The concentrations are likely too low. Opt for short, concentrated formulas.
• Serving sizes listed: a product that doesn't specify the amount per serving? Move on.
• Excipients and additives: titanium dioxide, carrageenans, artificial flavors… These are indicators of low-cost formulations. Choose products without artificial additives.
• Dosage form: gummies, capsules, ampoules, or oil in a dropper bottle? The dosage form affects bioavailability. Gummies, for example, often contain more sugar than nutritional content. Oil in a dropper bottle, on the other hand, preserves the integrity of the fatty acids and offers optimal bioavailability.
• Manufacturing: A formula manufactured in France offers stricter regulatory guarantees regarding traceability and quality control.

The IN & OUT Routine: Supplements and Topical Care

A dietary supplement works from the inside by nourishing the hair bulb. But for visible results on the hair shaft itself, external care is just as important. La Rayonnante, a nutricosmetic from Maison de l’Argousier, combines organic sea buckthorn berry oil (including 360 mg of omega-7 per serving), coenzyme Q10 (50 mg), lutein (10 mg), and vitamin E (12 mg, or 100% of the daily value). A very simple formula: 4 ingredients, 100% natural, made in France. One pipette per day, as a 28-day course that can be repeated. This antioxidant concentrate supports cellular regeneration and helps maintain healthy hair and nails. For external use, Secret Sublimant is a dry oil formulated with organic sea buckthorn oil, plant-based squalane, grapeseed oil, and sunflower oil. Thanks to its high omega-7 content, it nourishes the lengths and ends without weighing down or greasing the hair. When massaged into the scalp, it stimulates the hair bulb by promoting microcirculation and regulating sebum production. Two to three drops are sufficient. This IN & OUT approach, dear to Maison de l’Argousier, is based on the principle that hair beauty is built simultaneously from the inside (nutrition) and the outside (care). An approach that truly changes the game.

How long before I see results?

Hair growth follows a cycle lasting 2 to 7 years, with an active growth phase (anagen) during which hair grows about 1 cm per month. In practical terms, a hair supplement won’t produce dramatic results in two weeks. Expect 2 to 3 months of regular treatment before seeing an improvement in hair density, shine, and strength. Some placebo-controlled clinical studies, such as the one conducted on Phytocyane (85 volunteers, 12 weeks), show initial results on a phototrichogram as early as the first month, but effects visible to the naked eye take longer to appear. Patience and consistency: these are the two keys to a successful treatment regimen. The information provided is for informational purposes only and does not constitute medical advice. Consult your doctor or pharmacist.

FAQ

What is the most effective dietary supplement for hair?

There is no one-size-fits-all answer. The active ingredients with the best-documented efficacy are biotin (in cases of deficiency), zinc (maintenance of normal hair, validated European health claim), and vitamin B6 (cysteine synthesis). Omega-7, found in high concentrations in sea buckthorn oil, acts on keratin, sebum, and scalp inflammation. La Rayonnante by Maison de l’Argousier combines omega-7, coenzyme Q10, lutein, and vitamin E in a 100% natural, 4-ingredient formula.

What is the number one product for hair growth?

Hair growth depends on the health of the hair follicle. A healthy lifestyle, a balanced diet, and targeted supplementation are the key to success. Formulas that combine internal nutrition (omega-7, vitamins, antioxidants) with external care (nourishing scalp oil) deliver the most comprehensive results. This is the principle behind the IN & OUT routine.

How long does it take to see the effects of a hair supplement?

The hair growth cycle is slow: hair grows about 1 cm per month. The first effects of a hair supplement (shine, strength) usually appear after 4 to 6 weeks of use. For a noticeable increase in hair density, allow at least 3 months of regular use. Consistency is key.

Sources and references

• Vernet, A. “Sea Buckthorn (Hippophae rhamnoides L.)”. Phytothérapie, 4, 125–129 (2006). Springer link
• Dörnyei, O. and Dörnyei, J. “The phytotherapeutic properties of selectively bred sea buckthorn varieties.” Phytotherapy, 6, 109–114 (2008). Springer link
• VIDAL. “Dietary Supplements: Hair Loss.” Updated December 13, 2019. VIDAL link