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Results are not reported in this abstract, which raises the question of whether caffeine has a stimulating effect on hair growth both in laboratory settings and live subjects.

This review provides an overview of caffeine's effects on cancer, cardiovascular, immunological, inflammatory, and neurological diseases, highlighting both its potential benefits, such as neuroprotection and anti-aging, and possible adverse effects like elevated blood pressure, anemia, and migraine.

This study suggests that caffeine may enhance hair growth and be beneficial for cosmetic applications due to its high binding affinity to keratin, but further validation is needed.

This review discusses the use of caffeine in cosmetics for its fat-reducing, antioxidant, and hair growth properties, but reports no new research findings.

This review highlights caffeine's diverse benefits in cosmetics and nutricosmetics, noting its antioxidant properties, ability to treat skin disorders like androgenic alopecia, and potential to enhance sunscreen effectiveness, though penetration into deeper skin layers remains challenging.

This review discusses the potential benefits of using topical caffeine products for treating androgenic alopecia but reports no new clinical findings; the authors highlight caffeine's possible positive effects based on existing studies.

In this study, researchers found that adding coffee grounds to neutral shampoo, a popular DIY trend, resulted in peak caffeine extraction after seven days, with concentrations surpassing those in commercial products, suggesting educational potential for chemistry classes.

Caffeine in hair might help identify people, but it's not always reliable.

This study found that ex vivo, the skin permeability of caffeine increased with formulations using natural caffeine from coffee extract, particularly when combined with 2.5% Transcutol P, compared to synthetic caffeine formulations.

This study demonstrated that hair follicles significantly expedite the absorption of caffeine through the skin compared to interfollicular pathways.

This review examines the roles of adenosine and caffeine in regulating hair growth cycles but reports no new results, highlighting unanswered questions about their specific mechanisms.

This study found that caffeine enhanced hair growth and keratinocyte proliferation in human hair follicles, with female follicles showing greater sensitivity than male ones.

This review discusses recent patents on the cosmetic use of coffee and its by-products, highlighting their potential as promising topical formulation ingredients with skin health benefits.

In this review, the authors discuss caffeine's potential mechanisms and benefits as a hair loss treatment, noting its possible effectiveness and safety, though they caution that existing studies often have significant design flaws.

In this study, the authors conducted a systematic review to examine the effectiveness of caffeine supplementation on hair growth, finding the current evidence for caffeine's efficacy remains unclear.

This study found that regular caffeine consumption among medical students is linked to a higher risk of insomnia, with around 30% to nearly 50% of those surveyed reporting sleep disorders, and highlights the importance of health education on caffeine's side effects.

In this experimental laboratory study, three cream formulations containing 1% Caffeine Herbasome® were developed and evaluated for stability, homogeneity, pH, dispersion, and adhesion, with results showing satisfactory stability and suitable adhesion properties for skin application.

In this systematic review, the researchers observed that topical caffeine preparations appear safe and effective against hair loss, but most studies had low-quality evidence due to design flaws, indicating the need for better-designed trials before drawing definitive conclusions.

Caffeine may help hair growth in hereditary hair loss.

This study found that caffeine stimulated hair follicle growth in an ex vivo model of androgenetic alopecia, counteracting testosterone-induced suppression in male patient samples.

This study found that coffee berry extract demonstrated anti-aging properties in skin and hair cells, showing significant anti-collagenase activity and stimulating hair-related gene expression, suggesting its potential for use in cosmeceuticals.

In this study, caffeine applied in a shampoo penetrated hair follicles faster and more effectively than through the skin surface within the first 20 minutes.

This publication overview describes the Biomedical Journal of Scientific & Technical Research's rigorous peer review process and their focus on genetic, biomedical, and technical knowledge research within an open access format, but does not report specific study results.

This study found that a novel shampoo formulation effectively delivers caffeine to hair follicles, with 8–9% of absorbed caffeine reaching the follicles, suggesting it may support hair retention by enhancing antioxidant activity.

This study found that applying caffeine significantly improved the skin barrier function of male volunteers by reducing transepidermal water loss compared to female volunteers.

This review discusses caffeine's potential role in treating androgenetic alopecia by counteracting DHT effects on hair follicles and enhancing cell proliferation, but reports no new clinical results.

This study found that nanoemulsion formulations with oleic acid or eucalyptol significantly enhanced the delivery and retention of caffeine through hair follicles and surrounding skin regions.

In this study, the SFE-4 extract from coffee pulp demonstrated potential effects for treating androgenetic alopecia by enhancing cell proliferation and gene expression related to hair growth pathways in vitro, using human hair follicle dermal papilla and prostate cancer cells.

This study suggests that topical caffeine may be a safe and promising treatment for hair loss, but the researchers highlight the need for more large-scale randomized trials to confirm its efficacy.