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In this study, tresses treated with pH 1.0 acid straightener showed better straightening but more damage to hair properties compared to those treated with pH 2.0.

This study found that the acidic hair straightening formulation at pH 1.0 improved hair alignments and straightening effectiveness more than pH 2.0, but it weakened fiber strength and affected hair color and composition.

In this study, scalp hydration and pH levels were not significantly different between hijab-wearing and non-hijab-wearing women, suggesting that hijab-wearing does not impair scalp health if there's no history of underlying scalp or skin disorders and the hijab is not worn damp.

In this study, three hair tonic formulas containing Kayu Secang extracts demonstrated hair growth activity in rabbits, with the chloroform-methanol fraction showing the most significant results.

This study found that transparent shampoo bars containing high concentrations of aloe vera gel, castor oil, and cinnamon oil exhibited antimicrobial activity, reduced hair loss, and caused no skin irritation.

This study observed that a polyherbal hair oil made from virgin coconut oil and extracts of nine different herbs demonstrated effectiveness in promoting hair growth with a cooling effect and no reported side effects, based on various evaluated properties.

This study prepared and evaluated a polyherbal hair oil using plant-based ingredients, finding that it met standard parameters and effectively addressed hair problems such as growth and dandruff, with FDA approval for clinical use.

This study describes the development of an herbal hair oil using thirteen ingredients to address various hair problems like baldness, dandruff, and hair damage, although the abstract does not report results or evaluate efficacy.

This research highlights the formulation of herbal hair oil using ingredients like Neem, Castor oil, and Coconut oil to address hair problems caused by environmental pollution and chemical products, aiming to maintain healthy hair without long-term side effects.

This study reported that an herbal hair serum developed for general hair treatment met all assessment criteria, suggesting potential as a safer alternative to synthetic hair products.

This study formulated and evaluated a pure herbal hair oil using fenugreek seeds and aloe vera, reporting that the oil effectively promotes robust hair growth, offers anti-fungal and anti-dandruff properties, and enhances hair glossiness, surpassing the efficacy of existing marketed products.

In this study, researchers formulated a polyherbal hair oil using ingredients like coconut and castor oils, and reported that it boosts hair growth, reduces hair fall and dandruff, and adds shine, with minimal adverse effects compared to market formulations.

This review examines the pH levels of various shampoos and reports no new clinical results, highlighting the potential importance of labeling pH values on shampoo packaging for hair and scalp health.

The researchers reported that a coconut oil-based polyherbal hair oil developed using traditional medicinal plants demonstrated satisfactory physicochemical properties, including stability and pH suitability for scalp application, though further biological evaluation is needed to confirm therapeutic effects.

This study used melamine formaldehyde particles to measure a pH gradient along the hair shaft, showing a significant pH decrease from the hair sheath to the external shaft.

This study found that increasing the pH from 2.0 to 6.0 enhanced the binding of cationic solutes to hair keratin, driven primarily by hydrophobic and electrostatic interactions.

This study found that polyquaternium-68 at pH 9 achieved the greatest hair deposition, while polyquaternium-44 demonstrated the best wash resistance at pH 6.

In this study, the FIII micro emulsion formulation of virgin coconut oil and rice bran oil showed the best results for hair growth, increasing rabbit hair length by 1.26 cm in 18 days.

This study found that methylcellulose-based hydrogels can effectively deliver growth hormone through the skin, with albumin increasing the hormone's permeation to 93% in simulated in vivo conditions.

This study observed that hair properties vary by ethnicity, influenced by genetic, environmental, and cultural factors, and noted that ethnicity-dependent differences in surface charge and other properties warrant further investigation.

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.

Polisorbate 20 is not suitable for curl creams due to instability.

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 developed and evaluated a coconut oil-based polyherbal hair oil using various medicinal plants, finding it exhibited satisfactory physicochemical properties and stability, making it a promising hair care formulation, though further biological evaluation is needed to confirm therapeutic benefits.

In this experimental study using male rabbits, researchers found that a 7.5% concentration of green tea leaf ethanol extract hair tonic was nearly as effective in promoting hair growth as the positive control, minoxidil, over a 21-day period.

This study formulated and tested a new herbal hair oil combining fenugreek and aloe vera, reporting enhanced hair growth, effective dandruff protection, and a glossy finish, outperforming a marketed product while having minimal side effects.

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 sensitive scalp is characterized by increased pH levels, redness, altered sebum composition, and a disrupted microbiome, suggesting these features could inform treatment approaches.

In this study, a scalp care solution with 0.5% timosaponin B‐II from Anemarrhena asphodeloides significantly improved hair luster, reduced hair fall, enhanced scalp hydration, and decreased scalp redness over 28 days, suggesting benefits for scalp health and hair loss prevention.

This study found that stress increases the number of peptidergic nerve fibers and mast cell activity in mouse skin, suggesting a significant neuro-immune interaction under stress.