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In this study, a water-soluble nail strengthener containing Pistacia lentiscus and hyaluronic acid significantly improved the appearance and firmness of brittle nails in both in vitro and clinical settings.

This study found that Cynatine HNS significantly improved hair and nail health in women after 90 days compared to placebo.

This source describes Kudo Anti-Aging Gummies, which are promoted as a natural supplement designed to reduce wrinkles, enhance hair and nail health, and improve skin appearance by restoring collagen, with results purportedly visible within 1-2 months.

In this open-label study, participants reported that the LustrivaTM BH-002 two-step system improved various aspects of hair, skin, and nail health and appearance after three months of use.

In this narrative review, researchers found preliminary evidence suggesting that minoxidil, both topical and oral, may enhance nail growth and improve nail strength and appearance, though more extensive studies are needed to confirm its efficacy and safety for this off-label use.

This review reports that oral collagen peptide supplements may improve skin elasticity, hydration, and wrinkle appearance while also supporting hair and nail health and wound healing, but emphasizes the need for longer, high-quality studies due to current research limitations and variability in findings.

Minoxidil may improve nail growth and appearance.

This paper reviewed studies from 2019 to 2025 on the use of olive oil and other derivatives from the European olive tree for skin, hair, and nail care, noting their roles in wound healing and skin aging while highlighting a favorable safety profile.

Oral collagen improves skin, nails, hair, and reduces cellulite.

This chapter discusses various aspects of collagen, proposing "extended collagen carential disease" as a new concept tied to nutritional deficiencies, notably Vitamin C's role in maintaining collagen health.

This article presents an overview of uncombable hair syndrome, emphasizing its clinical and molecular characteristics and noting systemic manifestations such as neuropsychiatric, ophthalmic, and cardiopulmonary issues.

This source reports that biotin, a water-soluble vitamin B7, may benefit skin, hair, and nail health, including various types of alopecia, without the risk of hypervitaminosis even at high doses.

This study reported that Nyumi Happy Hair Gummies improved hair growth, thickness, density, and gloss in adults with hair fall, while also reducing hair fall and enhancing nail health, without any adverse effects reported during the trial.

This study analyzed the nutritional composition of 75 nutricosmetic products, finding common ingredients like biotin and zinc, but emphasized the need for further research on their effectiveness for hair and nail health.

In this clinical study, a vegan collagen builder (VEGCOL™️) was shown to safely and effectively improve hair growth, skin smoothness, wrinkle reduction, and joint pain relief in adults, with enhancements varying by dose over a 60-day period.

This extensive review discusses the clinical manifestations, potential associations, and treatment approaches for lichen planus, but reports no new clinical results, highlighting gaps in evidence for therapeutic strategies.

These guidelines review the management of complications and specific forms of congenital ichthyosis and report no new results; they summarize expert and evidence-based recommendations for clinicians.

This study observed that a combination of arginine silicate complex and magnesium biotinate significantly improved hair and nail growth in rats.

This review describes nail changes linked to various non-infectious skin diseases, highlighting how these alterations can help diagnose and manage conditions like psoriasis and lupus by noting specific and overlapping nail characteristics.

In this randomized, placebo-controlled study, Titagen® was found to improve skin, hair, and nail health in adults consuming 5g daily, and reduce pain and improve quality of life for osteoarthritis patients taking 10g daily, without related adverse events.

This study found that oral tofacitinib monotherapy improved nail changes in 73.3% of adults with moderate-to-severe alopecia areata over a median period of 5 months, but nail improvement was not linked to the severity of hair loss or hair regrowth.

This study suggests that nail loss may be a new, reversible adverse event related to teriflunomide treatment, akin to its known effects on hair loss.

This study observed that nail abnormalities often indicate underlying dermatological or systemic conditions, with psoriasis and infections being the most common causes among patients.

This study found that anisotropic osmolyte solutions may improve hair follicle turnover and condition in both in vitro and in silico models, as well as in human volunteers with hair disorders.

Hair regrowth was seen in 83% of children with alopecia, immune system plays a role in the condition, and various treatments showed effectiveness for hair and nail disorders.

This review discusses various adverse drug reactions affecting the skin, hair, and nails, emphasizing the importance of recognizing and reporting these reactions but reports no new clinical findings.

In this study, tofacitinib treatment in a male patient with alopecia areata led to significant hair regrowth and improvement in nail dystrophy symptoms, restoring finger function within 10 months.

This study found that 15% minoxidil topical solution was more effective than low-level laser therapy in improving hair regrowth and patient satisfaction in individuals with androgenetic alopecia.

This article reviews drug-induced hair and nail disorders and discusses their clinical recognition, underlying mechanisms, and potential treatment strategies, without presenting new research findings.

This study found that a combination of cantigi and henna leaf extracts, in a 1:2 ratio, demonstrated the strongest antioxidant activity with an IC50 value of 29.85 µg/mL.