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This study found that while the reproducibility of hair cortisol measurements in captive chimpanzees was high, the fineness of homogenized hair, sample weight, and extraction time influenced absolute cortisol concentrations.

This study concluded that a green tea extract hair tonic was stable, promoted more hair growth than 2.5% minoxidil, and did not cause skin irritation.

In this study, bleaching and perming were found to significantly reduce opiate concentrations in both spiked and naturally opiate-positive human hair samples.

This study concluded that drug-distribution measurements using micro-segmental hair analysis are effective for drowned bodies, as natural water containing divalent ions prevents drug washout from hair.

In this research on cinnamon and virgin coconut oil hair tonics, F2 and F3 demonstrated stable physical properties and mild irritation potential, while formula 1 remained non-irritating but less stable regarding pH and viscosity.

This study concluded that hair tonic formulated with galangal rhizome and Aloe vera extract was stable according to the Indonesian National Standard, showing consistent organoleptic, pH, and viscosity characteristics after stability testing.

This study found that hair tonics with 5% and 10% licorice extract promoted hair growth in rabbits similarly to 2% minoxidil and were generally safe, although they caused mild eye irritation at the 2.5% concentration.

This study investigated hair growth tonics made with celery leaf extract and found that 4% and 9% concentrations maintained better cyclic stability than 14%, supporting their potential use in herbal cosmetic development due to favorable physicochemical stability.

In this study, researchers developed cucumber-based hair tonics and tested their physical stability, finding them to be homogenous and meet requirements for color and pH, suggesting potential use as a remedy for hair loss.

Rutin may help regrow hair by stabilizing β-catenin and blocking GSK3β.

This study found that purified wood vinegar may promote hair growth in mice without toxicity, suggesting its potential use in treating baldness or alopecia.

In this study, researchers developed a hair tonic using shallots (Allium cepa L.) and found that its F2 formulation was as effective as the positive control in promoting hair growth on the 21st day and remained stable over 28 weeks of testing.

This study evaluated a hair tonic formulated from oil palm leaf extract, finding it demonstrated very strong antioxidant activity and could prevent hair decolorization from sun exposure, with effective concentrations ranging from 25 to 200 ppm.

In this study, variations in candle nut oil concentration (5%, 6%, 7%) impacted the characteristics and stability of a hair tonic nanoemulsion, influencing factors like droplet size, pH, and viscosity.

In this study, researchers found that stabilizing the protein HIF1A in hair follicles promotes glycolysis over oxidative phosphorylation, potentially reducing oxidative stress and supporting hair growth.

In this study, hair tonic formulations containing moringa leaf extract and honey were tested for stability and found to remain stable and non-irritating after storage, meeting specific quality standards.

This study formulated and evaluated the physical stability of hair tonic preparations using lime extract (Citrus aurantifolia) at varying concentrations. The researchers found that the tonics exhibited good physical stability, as indicated by meeting Indonesian National Standards, even after undergoing temperature cycling tests.

This study investigated the physical stability of hair tonic formulations made from ethanol extract of cayenne pepper leaves, finding that formulations with specific concentrations of propylene glycol and ethanol had good physical stability.

This study reported that a novel liposomal formulation, SP-bFGF-SF-LIP, enhanced bFGF stability and skin permeability, significantly improving hair follicle recovery and wound healing in a mouse model.

This study developed a stable nanoemulsion-based hair serum containing M. oleifera seed oil, which maintained its physical characteristics and reduced the oil's sticky texture, making it more suitable for hair loss treatment compared to traditional formulations.

In this study, a hair tonic containing fragrant pandan leaf extract and virgin coconut oil was formulated and evaluated, with most variations demonstrating physical stability except for one formulation, which showed instability in the specific gravity test.

This study concluded that a hair tonic combining aloe vera and celery extracts can be formulated, with formula 1 meeting the stability requirements best over a month.

This study found no difference in the physical stability of hair tonic preparations made from sansevieria leaves extract, regardless of whether maceration or soxhletation methods were used.

This study found that a single application of 'Lye' or 'No-Lye' chemical straighteners significantly reduced drug concentrations in hair samples from both drug-fortified standards and authentic drug users.

This study found that stabilizing HIF1A in hair follicle cells promoted a shift to glycolysis, potentially reducing oxidative stress and promoting hair growth, particularly in balding dermal papilla cells.

Stabilizing HIF1A in hair follicles may boost hair growth by enhancing energy production and blood vessel formation.

This source provides supplementary materials for the Carnivore Follicular Integrity Framework, a theoretical model proposing that animal-based diets may support hair follicle stability through several biological mechanisms. The materials include definitions, nutrient tables, and mechanistic notes but do not report empirical results.

This record provides supplementary materials for a theoretical model suggesting that animal-based diets may support hair follicle stability through various biological mechanisms, including regenerative peptides and anti-glycation protection.

This study found that a nanoemulsion hair spray formula with 25% PEG 400 showed promising physicochemical stability, but further research is needed to assess its colloidal stability and efficacy in hair growth.

This study found that hair care formulations containing argan oil were stable and demonstrated better spreadability and texture profiles compared to those without argan oil.