Emerging Herbal Cosmetic Production in Sri Lanka: Identifying Possible Interventions for the Development of the Herbal Cosmetic Industry

Although the herbal cosmetic industry has exponentially increased globally, manufacturing of herbal cosmetic products in Sri Lanka is still very limited. Therefore, objectives of the study were to recognize plants used in commercialized herbal cosmetic products and major constraints faced by herbal cosmetic manufacturers and to identify possible interventions for the development of herbal cosmetic industry of Sri Lanka. Information was gathered via a semistructured questionnaire by personal interviews with 11 large-scale multiple herbal cosmetic products manufacturers. Collected data were analyzed via frequency index for usage and descriptive statistics. A total of 115 plant species belonging to 56 families were identified. Extensive usage of Aloe vera (L.) Burm.f., Coscinium fenestratum (Goetgh.) Colebr., and Santalum album L. (90.91%) was reported among herbal cosmetic manufacturers. The highest number of plants or plant materials was used for manufacturing skin care products (54.78%) followed by hair care (19.13%) and oral care (6.96%). The majority of plants were reported from the plant family Fabaceae (16 species). Leaves (20.87%) were the widely used plant part, whereas 10 plant species were used as whole plants. Inadequacy of 7 plants/plant materials and importation of 8 plant materials for the production were also recognized. As major constraints faced by herbal cosmetic manufacturers, inadequate availability and poor quality of raw materials were emphasized. In conclusion, establishing proper cultivation system, implementing strategies for quality control of raw materials, and conducting ethnobotany, ethnopharmacological surveys to identify cosmetic potential of medicinal plants and partnerships with universities to transfer technology for product development to industries are possible interventions for the development of herbal cosmetic industry of Sri Lanka.


Introduction
Sri Lanka, formerly known as Ceylon, is an island with an area of approximately 65,610 km 2 . Despite its relatively small size, Sri Lanka possesses a high level of biodiversity due to its varied climate and topographical conditions [1]. Plants have been used for treating illnesses over a thousand years by four systems of traditional medicine in Sri Lanka called Ayurveda, Siddha, Unani, and Deshiya chikitsa [2]. As a biologically diverse country in Asia, Sri Lanka currently possesses 29.7% of forest cover [3], 4143 plant species distributed within 214 families, and 1522 genera. Of these, 1025 plant species are endemic to the country [4]. Among the native flora of Sri Lanka, more than 1,400 plants are used in indigenous medicine [5]. Many formulae for medicinal preparations of Sri Lankan traditional system of medicine are handed down from generation to generation or are found only in the scripts of old "ola leaf" books treasured by traditional and Ayurvedic practitioners [6]. e study conducted by Kankanamalage et al. [7] reveals the sources of medicinal plant materials that are obtained for numerous medicinal plant-based trades. About 71.13% of these medicinal plants/herbal materials are obtained from local sources, 26% are imported, while 2.87% are obtained through either route. Moreover, it reveals that 80% of both fresh and dry plant materials contribute to the herbal industry. us, it clearly implies the importance of medicinal plants in different systems of medicine in Sri Lanka. Moreover, the study conducted by Dissanayake [8] on "Medicinal plant research in Sri Lanka: a scientometric study based on Scopus database" highlights about research studies of 190 plants including 22 endemic plants. It reveals that most of the conducted studies were activity-based studies such as toxicity, antibacterial, antifungal, hypoglycemic, antioxidant, anti-inflammatory, and diuretic. is was followed by general studies such as physicochemical, chemical, postharvest, horticultural, and propagation studies of plants.
is study evidently indicates the largely unexplored knowledge gap of medicinal plants in Sri Lanka. e global consumption of herbal cosmetics has shown spectacular growth in recent years due to the growing recognition of long-term health benefits [9,10]. According to the available market research, the current global natural and organic personal care products market is valued approximately US$ 11 billion and is expected to reach US$ 22 billion by 2022 [11]. us, the global enormous demand for herbal cosmetics results in a huge trade from local to the international level. Consequently, there are ample opportunities for Sri Lanka to expand its herbal cosmetic productions through its unique biodiversity of medicinal flora and a rich base of traditional knowledge. However, there has been a dearth of published information on herbal cosmetic production and plants used in the herbal cosmetic industry of Sri Lanka. Although the herbal cosmetic industry has significantly increased throughout the world, the supply of herbal cosmetic products from Sri Lanka is still very limited. erefore, it is crucial to identify major constraints faced by herbal cosmetic manufacturers to identify possible interventions for the development of the herbal cosmetic industry of Sri Lanka. At present, this becomes a necessary area to be addressed within the country as this is one of industries which can easily capitalize the global trends.
us, the objective of this present survey was to identify plants and plant parts used in commercialized herbal cosmetic products in Sri Lanka especially under the categories of skin care, hair care, and oral are. e constraints faced by herbal cosmetics manufacturers and their suggestions were also studied to identify possible interventions for the future improvements of the herbal cosmetic industry in Sri Lanka.

Study Area and Selection of Respondents.
Any herbal product to be sold to the public must be registered under the Department of Ayurveda, Sri Lanka. erefore, herbal cosmetic manufacturers were selected based on the registry maintained for herbal products at the Department of Ayurveda, Sri Lanka. is survey was conducted from January to August 2018. In total, 18 herbal cosmetic manufacturers in Sri Lanka were identified. Among these, 13 herbal cosmetic manufacturers were pioneers in the herbal cosmetic industry of Sri Lanka, while the rest were smallscale herbal cosmetic manufacturers. Prior to data collection, each respondent was informed of the aims and objectives of the study to obtain their consent and cooperation for the survey. However, permission was received only from 11 large-scale herbal cosmetic manufacturers to carry out the survey and to gather the information. Among them, 9 manufacturing factories were in the Western Province, Sri Lanka, while other two factories were in the Central Province and Southern Province, Sri Lanka, respectively.

Preparation of Questionnaire.
Information was collected via a semistructured questionnaire (Supplementary 1) under two main sections. e first section was designed to gather general information about the organization including the organization name/name of the organization representative, experience of the profession, address, province/district, and registration number assigned by Ayurveda Department. e second section of the questionnaire was prepared to gather the following major information: (1) manufacturing herbal cosmetic products under skin care, hair care, and oral care categories; (2) medicinal plants and plant parts used for productions; (3) sources (local/import) of herbal materials; and(4) availability (sufficient/insufficient) of herbal materials. Furthermore, main challenges and difficulties in herbal cosmetics production and suggestions were recorded for identifying future improvements of the herbal cosmetic industry in Sri Lanka.

Data Collection and Quantitative Analysis.
Personal interviews were conducted. During the survey, the information mentioned in Section 2.2 was specifically obtained. Plants/plant materials were collected at the manufacturing sites. Furthermore, collected plants/plant materials were dried, preserved, and mounted on herbarium sheets. Herbarium voucher numbers were coded from NGHC 01 to NGHC 115 as the same order of the plant list indicated in Table 1. Plant identification was carried out by comparing the deposited herbarium of the royal botanical garden, Peradeniya, Sri Lanka. e scientific names of plants were validated based on the collections listed in the homepage (http://www.theplantlist.org). Vernacular names and English names of plants were verified using the Ayurveda authentic books, "Compendium of medicinal plants, Sri Lankan study," volumes I to IV issued by Ayurveda Department of Sri Lanka and "A collection of medicinal plants in Sri Lanka," issued by Nature's Beauty creations limited, Sri Lanka. Collected data were tabulated and analyzed using descriptive statistics. e frequency index for usage of each plant was calculated using the following formula described by Dharmadasa et al. [12]: where "n" is the total number of cosmetic manufacturers who listed a particular plant species for their cosmetic productions and "N" is the total number of large-scale multiple range of cosmetic products manufacturers.

General Overview about Herbal Cosmetic Manufacturers in Sri
Lanka. e total respondent percentage was 61 from requested herbal cosmetic manufacturers. All, 13 large-scale manufacturers produce multiple products under the categories of skin care, hair care, and oral care, whereas smallscale manufacturers produce only single products. 7 herbal cosmetic manufacturers refused to provide necessary information to support the survey because their formulae were based on family recipes. However, 10 leading large-scale private sector herbal cosmetic manufacturers and a state herbal cosmetic manufacturer cum under the Ministry of Indigenous medicine, Sri Lanka, were interviewed to gather the information. Totally, 9 cosmetic manufacturers were located in Colombo, Kalutara, and Gampaha districts belonging to Western Province, while other 2 are located in Galle District of Southern Province and Kandy District of Central Province, respectively ( Figure 1). Of these, 5 companies only cater for the local market, whereas 6 companies cater for both local and international markets. is is further proven by the list of Ayurvedic herbal products exporters in Sri Lanka published on the website of Export Development board, Sri Lanka [13]. Furthermore, multiple herbal cosmetic products under skin care, hair care, and oral care categories are manufactured by all interviewed herbal cosmetic manufacturers. Creams (moisturizer, fairness creams, night creams, and foot creams), lotions (body lotions), soap, cleansers (body wash, face wash, and hair shampoo), gel (hair, body, and face), scrubs (face, body, and foot), and mask (powder pack, creamy face masks, and foot pack) are some of main products manufactured under the skin care and hair care category, while herbal toothpastes and mouth washes are major products manufactured under the oral care category.
e greatest utilization of medicinal plants in family Fabaceae under different disciplines such as Ayurveda, traditional systems of medicine, and medicinal plantrelated industries in Sri Lanka has also been reported in [2,7,12,14]. Furthermore, these studies highlight the prominent usage of medicinal plants in Rutaceae, Asteraceae, Poaceae, Zingiberaceae, Malvaceae, Apocynaceae, Euphorbiaceae, and Lamiaceae plant families. Figure 2, plant species used for cosmetic purposes can be classified into three main categories called skin care, hair care, and oral care. Out of 115 plants, the highest number of plants/plant materials was used in skin care products. It was reported as 63 plant species (54.78%). 22 plant species (19.13%) were used for hair care products, while 8 plant species (6.96%) were used in oral care products. However, 16 plant materials (13.91%) were used in both skin and hair care products, whereas 3 plant materials (2.61%) were used in both skin and oral care products. Furthermore, usage of Terminalia chebula Retz in both oral and hair care products as well as usage of both Glycyrrhiza glabra L. and Cinnamomum verum J.Presl in all three cosmetic products categories were also reported. Moreover, research study conducted by Nirmalan [14] on cosmetic perspectives of ethnobotany in Northern part of Sri Lanka confirms the higher usage of local plants for skin care followed by hair care.

Different Plant Parts Used in Cosmetic Productions.
As shown in Figure 3, a wide range of plant parts are used for herbal cosmetics manufacturing in Sri Lanka. Identified plant parts were reported as leaves, fruit, seeds, bark, flower, root, stem, fruit rind, rhizome, flower stamen, heartwood, flower buds, bran, leaf gel, prop roots, and tuber. e most utilized plant part was reported as leaves (20.87%). is was followed by fruit (17.39%), seed (14.78%), bark (9.57%), flower (7.83%), root (6.96%), fruit rind (5.22%), stem (4.35%), rhizome (3.48%), flower stamen, heartwood (2.61% per each), flower bud (1.74%), bran, leaf gel, prop roots, and tuber (0.87% per each), respectively. Usage of whole plant was recorded as 8.70%. In line with the studies of Napagoda et al. [2], Kumarasinghe [6], Kankanamalage et al. [7], Dharmadasa et al. [12], and Nirmalan [14], leaves were the commonest part of plants used in different treatments of Ayurveda, traditional system of medicine, and medicinal plant-based industries in Sri Lanka. Moreover, Kumarasinghe [6] stated that availability of most effective ingredients in leaves results in the highest usage. However, more scientific studies related to this area are required. As other reasons, Dharmadasa et al. [12] highlights availability in large quantities, easy accessibility, and cheaper costs for the abundance usage of leaves. ese are in further agreement with scientific studies conducted by Miraldi et al. [15], Ghorbani [16], and Mowobi et al. [17] from other countries.

Availability of Plant Materials for Cosmetic Productions.
Most of the cosmetic manufacturers mentioned about inadequate availability of 7 plant materials out of 115 plants for cosmetic productions in line with the existing demand. As they stated, Mesua ferrea L., Kokoona zeylanica waites, Dillenia retusa unb., Coscinium fenestratum (Goetgh.) Colebr., Melaleuca leucadendra (L.) L., Santalum album L., and Bacopa monnieri (L.) Wettst. plant materials belonging to following plant families Calophyllaceae, Celastraceae, Dilleniaceae, Menispermaceae, Myrtaceae, Santalaceae, and Plantaginaceae were insufficient. Of these, Kokoona zeylanica waites and Dillenia retusa unb are endemic to Sri Lanka. According to the viewpoint of cosmetics manufacturers, the main motive for the scarcity of these plant materials is lack of proper cultivation system within the country. Furthermore, Kankanamalage et al. [7] has revealed that Coscinium fenestratum (Goetgh.) Colebr. and Bacopa monnieri (L.) Wettst. are heavily used plants in Sri Lanka. Likewise, both Kankanamalage et al. [7] and Dharmadasa et al. [12] have mentioned about the limited availability of Santalum album L. in the Sri Lankan market.

Difficulties Encountered during the Collection of Plant
Materials for Cosmetic Productions. Majority of cosmetics manufacturers emphasized about several constraints that they faced during the collection of plant materials for cosmetic productions. As they highlighted, quality of plant materials was one of the major constraints. Most of cosmetic manufacturers believed that imported plant materials are adulterated, or the active ingredients are partially extracted which cannot be identified through physical observations during buying. Furthermore, harvesting restrictions imposed by the government for some wild species such as Coscinium fenestratum (Goetgh.) Colebr which owns the highest frequency usage in the industry has created a greater impact on continuous productions due to declining suppliers. On the contrary, insufficient or absence of continuous supply of plants/plant materials was another major issue faced by cosmetic manufactures. For example, lack of growers and suppliers of Bacopa monnieri (L.) Wettst. has become a big issue as a large quantity is required in fresh state for the production. All statements given by cosmetic manufactures were clearly evident for the lack of proper cultivation system within the country. Moreover, most of cosmetic manufacturers revealed about sales issues of locally manufactured herbal cosmetic products as foreign cosmetic products have currently invaded the cosmetic market in Sri Lanka.

Knowledge Gaps and Directions for Future Researches.
As Napagoda et al. [18] stated, only handful of scientific evidence are available on bioactivity studies of medicinal plants in Sri Lanka that could lead to the development of herbal cosmetics. Apart from the study on "Cosmetic perspective of ethnobotany in Northern part of Sri Lanka" [14], there has been hardly any ethnobotany report on cosmetic potential of medicinal plants in Sri Lanka. erefore, ethnobotanical and ethnopharmacological surveys to identify the cosmetic potential of medicinal plants are crucial because most of traditional knowledge on medicinal plants and treatment are passed from generation to generation within families in Sri Lanka. Furthermore, establishing proper systematic cultivation systems for identified medicinal plants is paramount to overcome the insufficient and absence of continuous supply of raw materials for the production. is field must cover the preparation of growing media, preparation of seed or seedling, preparation of land, and preparation of seedbed, fertilizing, harvesting, and postharvest practices. Utilization of biotechnology such as tissue culture will benefit to preserve biodiversity through utilizing plants which are endangered or unavailable through conventional production or wild crafting. Moreover, conducting efficacy/ safety tests on medicinal plant ingredients are important to ensure the physical and analytical characteristics of raw materials used for the production up to the standard. Additionally, product development and innovation are other key factors to succeed the herbal cosmetic industry. us, external collaborations with universities or research institutes will provide possible opportunities to transfer technology to herbal cosmetic industry of Sri Lanka.

Conclusion
e present study reports the first survey conducted to exploit the plants used in herbal cosmetic industry and to identify major constraints faced by herbal cosmetic manufacturers in Sri Lanka. To overcome the issues faced by herbal cosmetic manufacturers, establishing proper cultivation system and implementing strategies for quality control of raw materials have become necessary requirements of the country to be addressed in the future. Conducting ethnobotany and ethnopharmacological surveys to identify cosmetic potential of medicinal plants and partnerships with universities to transfer innovative aspects of technology for product development to industries are possible interventions for the development of herbal cosmetic industry of Sri Lanka. Furthermore, findings of the study may provide necessary information for potential growers, suppliers, manufacturers, and researchers to identify interesting cosmetic potential plants for cultivation, trading, and innovation or to use for new purposes.

Data Availability
e data used to support the findings of this study are included within the article.

Consent
Written informed consent was obtained prior to the study.

Conflicts of Interest
e authors declare that they have no conflicts of interest regarding the publication of this article.

Supplementary Materials
Supplementary Material 1: the questionnaire which was used to collect the information on plants/plant materials used in herbal cosmetic industry of Sri Lanka and some demographic information of the herbal cosmetic manufacturers. (Supplementary Materials)