Tab. 1

Composition of humectant formulation samples"

Tab. 2

Questionnaire on the status of the lips of volunteers"

Fig. 1

Effects of lip oil on physiological parameters of lip skin in the North and East China group. A-H represent skin moisture, TEWL, gloss, elasticity （R2）, L* value, a* value, b* value and texture value, respectively （Significance labeling method: 1. Lip basal state efficacy evaluation parameters: East China group compares with North China group, and “&&&&” indicates a significant difference, P<0.000 1; 2. Compared with the basic state of subjects in East and North China after using lip oil, “*”, “**”, “***”, “****” indicate significant difference, with 0.01≤P<0.05, 0.001≤P<0.01, P<0.001, P<0.000 1，respectively；“—” indicates the same distinctiveness）"

Fig. 2

Effects of lip oil on physiological parameters of lip skin in subjects aged 18-35 years and 35-60 years. A-H represent skin moisture, TEWL, gloss, elasticity （R2）, L* value, a* value, b* value and texture value, respectively.（Significance labeling methods: 1. Efficacy evaluation parameters of the basic state of the lip: 18-35 years old group compares with 35-60 years old group, and “&”, “&&”, “&&&&” indicate significant difference, with 0.01≤P<0.05, 0.001≤P<0.01, P<0.000 1, respectively; 2. Compared with the basic state of the subjects after the use of lip oil in the age groups of 18-35 and 35-60: “*”, “**”, “***”, “****” indicate significant difference, with 0.01≤P<0.05, 0.001≤P<0.01, P<0.001, P<0.000 1, respectively; “—”indicates the same distinctiveness）"

Fig. 3

Different clinical features of subjects’ lips （A: Lips of subjects of different genders; B: Images of the lower lip of female subjects; C: Images of the lower lip of male subjects; a, b and c represent female subjects aged 20, 35 and 54, respectively, and d, e and f represent male subjects aged 20, 35 and 54, respectively）"

Fig. 4

Effects of lip oil on physiological parameters of lip skin in male and female group. A-H represent skin moisture, TEWL, gloss, elasticity （R2）, L* value, a* value, b* value and texture value, respectively （Significance labeling method: 1. Efficacy evaluation parameters of the basic state of the lips: male group compares with female group, and “&” indicates a significant difference, 0.01≤P<0.05; 2. Male and female subjects after the use of lip oil compares to the baseline state of the subjects: “*”, “**”, “***”, “****” indicate significant difference, with 0.01≤P<0.05, 0.001≤P<0.01, P<0.001, P<0.000 1, respectively；“—” indicates the same distinctiveness）"