MaryRuth Hair Growth Review

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MaryRuth is best known for its multivitamins, but the company also offers a supplement called Hair Growth. While most of the formula is very similar to its standard multivitamin, it includes a few additional ingredients that are marketed as supporting healthier hair. The key question is whether those extra ingredients actually turn it into an effective hair growth supplement or simply make it a slightly modified multivitamin.

Ingredients in MaryRuth’s Hair Growth

Lustriva

The biggest addition is Lustriva, an ingredient that MaryRuth highlights as being backed by clinical research. At first glance, that sounds promising. However, when you take a closer look at the study behind the claims, several major limitations make the results much less convincing.

The most obvious issue is the extremely small sample size. The study included just 12 women, which is far too few participants to draw reliable conclusions. The study population also raises concerns because the women were generally healthy and did not have significant hair loss. As a result, the findings don’t tell us much about whether Lustriva can help people who are actually experiencing hair thinning or hair loss.

Another major problem is that the study was open-label and did not include a placebo group. In other words, participants knew they were taking a product that was supposed to improve their hair, skin, and nails. When people expect a supplement to work, those expectations can influence how they perceive the results, even if little or no meaningful change has occurred.

The outcomes measured in the study add another layer of uncertainty. Rather than using objective measures such as hair counts or other clinical assessments, researchers relied largely on self-reported surveys. Participants were asked whether their hair appeared thicker, whether their skin looked healthier, and whether facial lines seemed less noticeable. These types of questions measure personal perception, not actual biological changes, and perceptions can easily be influenced by expectations.

It’s also worth noting that participants received free products and gift card compensation for completing the surveys. While that doesn’t automatically invalidate the research, it can encourage more favorable responses, particularly in a small, non-blinded study that depends heavily on subjective feedback.

There is another important limitation. The study did not evaluate Lustriva by itself. Participants used both oral capsules and a topical hair serum at the same time. Because multiple products were used together, it’s impossible to determine whether Lustriva was responsible for any of the reported benefits.

Funding is another factor to consider. The study was sponsored by the company behind the product. Industry-funded research is not automatically unreliable, but studies funded by manufacturers are more likely to report positive findings than independently funded research.

When all of these issues are considered together, the study looks more like a consumer satisfaction survey than strong clinical evidence. The lack of blinding, placebo controls, objective outcome measures, and a sufficiently large sample size means the research does not provide convincing proof that Lustriva improves hair growth, hair health, skin quality, or nail strength.

That conclusion becomes even less surprising when you look at what Lustriva actually contains. It is a proprietary blend of inositol-stabilized arginine silicate and magnesium biotinate. In practical terms, the ingredient primarily provides biotin and the amino acid L-arginine, along with smaller amounts of silicon, inositol, and magnesium.

L-arginine

L-arginine is an amino acid that helps your body produce nitric oxide, a compound that relaxes and widens blood vessels. Because of this effect, arginine is often marketed to athletes as a way to improve blood flow and exercise performance.

However, when it comes to hair growth, the evidence simply isn’t there. Currently, no human clinical studies show that L-arginine promotes hair growth or helps reverse hair loss. Even in areas where arginine has shown potential benefits, researchers typically use much larger doses than what’s found in MaryRuth’s Hair Growth formula. In some athletic studies, participants take more than 20 grams per day. By comparison, the small milligram amounts included in this supplement are unlikely to have any meaningful impact on hair growth.

Biotin

MaryRuth’s Hair Growth also contains a much larger dose of biotin than the company’s standard multivitamin—more than 30 times as much. That’s somewhat surprising because the regular formula already provides roughly 10 times the recommended daily intake of biotin.

Hair growth supplements often rely heavily on biotin because it’s inexpensive, widely recognized, and commonly associated with healthy hair. Yet when we examine the scientific evidence, the case for biotin is far weaker than many people realize.

In fact, only one study has specifically investigated biotin as a treatment for hair loss. In that study, people with alopecia areata received injections containing both biotin and vitamin B5. Some participants experienced improvement, but the study had several significant weaknesses. Most notably, it lacked a placebo group, making it impossible to determine whether the treatment itself caused the improvements. On top of that, biotin was combined with vitamin B5 and delivered by injection, so the results cannot tell us whether oral biotin supplements would have any effect on hair growth.

The evidence for nail health isn’t much stronger. One small study found that people with brittle nail syndrome developed thicker nails and experienced less splitting after taking biotin supplements. However, this study also lacked a placebo group, making the results difficult to interpret with confidence.

Most of the remaining evidence comes from case reports, where doctors observed improvements in individual patients after biotin supplementation. While these reports can be interesting, they represent one of the weakest forms of scientific evidence. They lack control groups, randomization, and large sample sizes, making it difficult to know whether biotin was truly responsible for the improvements.

So, does biotin help hair and nail growth? For most people, the answer is probably no. The limited research available suggests that any benefits are mainly seen in people with specific conditions, such as alopecia areata or brittle nail syndrome, rather than those with normal hair and nails.

Some people argue that biotin supplements make sense because biotin deficiency can cause hair loss. And that’s true—severe biotin deficiency can contribute to hair thinning and other symptoms. The problem is that genuine biotin deficiency is extremely rare in people who eat a normal, balanced diet.

Biotin is naturally found in many common foods, including dairy products, eggs, meat, nuts, and seeds. Your body also needs only about 30 micrograms per day, an amount that’s typically easy to obtain through food alone. For the average healthy adult in North America, taking extra biotin is usually unnecessary.

That said, a few groups do face a higher risk of deficiency. Certain rare genetic disorders can interfere with biotin metabolism, although these conditions affect fewer than one in 100,000 people. Some medications may also reduce biotin levels.

Researchers have also found lower biotin levels in some older adults, people with alcohol use disorders, and smokers, particularly women. Mild biotin deficiency may also occur more frequently during pregnancy and breastfeeding.

At first glance, this might seem like a strong argument for biotin supplementation. However, studies comparing people with hair loss to those without it generally fail to find meaningful differences in biotin levels. In other words, even when mild deficiency is present, correcting it does not necessarily lead to noticeably thicker hair or reduced shedding.

Put simply, most people experiencing hair loss are unlikely to be biotin deficient in the first place.

Silicon

Another ingredient commonly promoted for hair health is silicon. Like biotin, the theory behind silicon sounds promising, but the actual human research is limited.

One small study found that women with fine hair who took 10 milligrams of silicon daily experienced modest improvements in hair thickness and strength. However, the study did not show new hair growth, an increase in hair follicle numbers, or any reversal of balding. At best, the evidence suggests that silicon may slightly improve the appearance and quality of existing hair rather than stimulate meaningful hair growth.

Is MaryRuth’s Multi + Hair Growth Effective?

So, does MaryRuth’s Multi + Hair Growth actually work? If you have a significant nutrient deficiency or a specific condition such as brittle nail syndrome, you may notice a modest improvement in hair or nail quality. However, for most healthy adults, the evidence does not support expecting meaningful improvements in hair growth.

While the formula contains ingredients commonly associated with hair health, the research behind those ingredients is either limited, weak, or focused on people with specific deficiencies or medical conditions. As a result, MaryRuth’s Hair Growth appears far more likely to function as a high-dose multivitamin than as a truly effective hair growth supplement.

Overall rating

MayRuth-Hair-growth-review-overall-summary-rating — Overall rating MaryRuth Multi + Hair Growth supplement review summary

Rating MaryRuth’s Multi + Hair Growth by effectiveness for improving hair loss, I’m giving it a D. Unless you have a significant nutritional deficiency, it’s unlikely to make much difference for your hair or nails. Rating it by cost, I’m giving it an D. The formula can be replicated for a fraction of the cost. Rating it for safety, I’m giving it a B. The ingredients and doses used are unlikely to be of much cause for concern. Overall rating, I’m giving a D. I would not recommend it at all.

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Citations

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