1 Introduction
External health care for men has become an important growth point in the health industry in recent years, with its core demands focusing on the maintenance of reproductive system functions, and the health of body surface skin and hair. Traditional external health care products mostly rely on chemically synthesized ingredients. Although they have significant short-term effects, long-term use is likely to cause skin irritation, drug resistance and other problems, prompting the market to turn to the development of natural plant-derived ingredients. Cistanche (Cistanche deserticola Ma) belongs to the genus Cistanche of Orobanchaceae, mainly produced in the arid desert areas in northwestern China. Known as the "Ginseng of the Desert", it is a commonly used tonic Chinese medicinal material included in the Pharmacopoeia of the People's Republic of China.
In traditional Chinese medicine theory, Cistanche is "sweet, salty, warm, and belongs to the kidney and large intestine meridians", with the core efficacy of invigorating kidney yang and replenishing essence and blood. Traditionally, it is mostly used for oral administration to treat insufficient kidney yang, deficiency of essence and blood and other symptoms. Modern research shows that the active components of Cistanche can exert local biological effects through skin penetration and absorption. Its characteristics of antioxidation, anti-inflammation and improving local microcirculation are highly consistent with the core needs of men's external health care. Based on existing pharmacological research and application practices, this paper focuses on the value of Cistanche in the field of external use for men, providing theoretical support for its industrial application.
2 Core Active Components and External Application Characteristics of Cistanche
The external health care efficacy of Cistanche is closely related to its specific composition of active components. Among them, phenylethanoid glycosides (such as echinacoside and acteoside), polysaccharides, and flavonoids are the key substances for exerting effects. The physical and chemical properties of these components enable them to have good skin penetration and bioavailability.
2.1 Phenylethanoid Glycosides: Core Active Substances
Phenylethanoid glycosides are the most abundant and in-depth studied active components in Cistanche, accounting for 5% - 10% of its dry weight. Among them, acteoside and echinacoside are regarded as characteristic components. This type of compound has strong water solubility and fat solubility, and can penetrate through the lipid bilayer of the skin stratum corneum to enter the dermis and exert local effects. Pharmacological studies have confirmed that phenylethanoid glycosides have significant antioxidant activity, which can scavenge reactive oxygen species (ROS) in the skin and subcutaneous tissues, inhibit lipid peroxidation, and reduce the production of malondialdehyde (MDA); at the same time, they can activate the antioxidant enzyme system, increase the activities of superoxide dismutase (SOD) and glutathione peroxidase (GSH-Px), and reduce oxidative stress damage through dual pathways. This characteristic provides a core functional basis for its application in skin anti-aging and reproductive system protection.
2.2 Polysaccharide Components: Auxiliary Synergistic Carriers
Cistanche polysaccharide is a heteropolysaccharide composed of monosaccharides such as glucose, galactose, and arabinose, with a content of about 15% - 20%. This component has good water solubility and biocompatibility. When used externally, it not only has certain anti-inflammatory and immunomodulatory effects itself, but also can be used as a carrier for active components. It can prolong the residence time of drugs on the skin surface by increasing the adhesion of the preparation, and promote the penetration and absorption of core components such as phenylethanoid glycosides. In addition, Cistanche polysaccharide has moisturizing properties, which can combine with keratin in the skin stratum corneum to form a hydrated film, reducing water loss. This characteristic makes it have both efficacy and skin care properties in men's skin health care preparations.
2.3 Other Active Components: Supplementary Synergistic Effects
Cistanche also contains flavonoids, amino acids, trace elements and other components. Flavonoids can inhibit tyrosinase activity, reduce melanin production, and have a certain anti-inflammatory effect; amino acids (such as proline and alanine) provide nutrients for skin cell metabolism and promote stratum corneum repair; trace elements such as zinc and selenium participate in redox reactions in the body and assist in enhancing antioxidant effects. These components work synergistically with phenylethanoid glycosides and polysaccharides to jointly improve the external health care efficacy of Cistanche.
3 Mechanism of Action and Application Scenarios of Cistanche in External Health Care for Men
Based on the pharmacological characteristics of the core active components, Cistanche has formed multi-dimensional application scenarios in men's external health care. Its mechanism of action focuses on improving the local microenvironment, protecting cell functions, and regulating physiological status, which are specifically concentrated in three major fields: reproductive health, skin anti-aging, and hair care.
3.1 Reproductive Health Maintenance: Improving Local Microenvironment and Cell Protection
The health of the male reproductive system is closely related to the local microcirculation and oxidative stress state. With the increase of age or the influence of bad living habits, the microcirculation of the skin and mucous membrane in the reproductive area is prone to obstacles, and the level of oxidative stress increases, leading to insufficient nutrient supply to local tissues, decreased cell activity, and then causing problems such as functional decline. When Cistanche is used externally, its phenylethanoid glycoside components can penetrate the skin and enter the subcutaneous tissue of the reproductive area, exerting multiple effects:
First, it improves local microcirculation. Studies have shown that acteoside can dilate capillaries, increase blood flow, reduce blood viscosity, promote the supply of oxygen and nutrients to the tissues of the reproductive area, and relieve the state of ischemia and hypoxia in local tissues; second, it has antioxidant and cell protection effects. By scavenging ROS and inhibiting lipid peroxidation, it reduces the damage of oxidative stress to germ cells and mucosal epithelial cells, and maintains the structural integrity and physiological functions of cells; third, it has anti-inflammatory effects. For common chronic inflammations in the reproductive area (such as balanoposthitis), the phenylethanoid glycoside components in Cistanche can inhibit the release of inflammatory factors (such as TNF-α, IL-6), reduce inflammatory reactions, and relieve symptoms such as redness, swelling and itching.
In vitro experiments have confirmed that after the Cistanche extract acts on the reproductive mucosal epithelial cells, the cell survival rate increases by 20% - 30%, the MDA content decreases by more than 40%, and the SOD activity increases significantly. Clinical observations show that when the external gel containing Cistanche components is used to improve the symptoms related to men's reproductive health, the effective rate reaches 65% - 75%, and there is no obvious irritation reaction.
3.2 Skin Anti-aging: Dual Effects of Antioxidation and Repair
Men's skin secretes a lot of oil, and when exposed to the external environment for a long time, it is easily affected by factors such as ultraviolet rays and pollutants, leading to increased oxidative stress, loss of collagen, and problems such as wrinkles, sagging, and roughness. The mechanism of action of external Cistanche in skin anti-aging is mainly reflected in two aspects:
First, it has strong antioxidant properties to delay aging. Phenylethanoid glycoside components can penetrate the skin stratum corneum, scavenge ROS in the dermis, inhibit the activity of matrix metalloproteinases (MMPs), reduce collagen degradation, and at the same time promote the proliferation of fibroblasts and collagen synthesis, increasing skin elasticity; second, it repairs the skin barrier. Cistanche polysaccharide can form a moisturizing film on the skin surface, reducing water loss. At the same time, the amino acid components it contains can provide nutrients for the stratum corneum cells, promote the repair of damaged barriers, and improve skin problems such as dryness and roughness.
Relevant experiments show that after 4 weeks of external use of the lotion containing 5% Cistanche extract, the depth of skin wrinkles of the subjects is reduced by 12%, the skin moisture content is increased by 25%, and the skin elasticity is increased by 18%, which confirms that it has a clear anti-aging effect.
3.3 Hair Care: Promoting Follicle Health and Hair Growth
Hair loss is a common health problem in men, and its core causes include follicle atrophy, decreased activity of dermal papilla cells, and local blood circulation disorders. External use of Cistanche can improve hair health through multiple pathways: first, it promotes follicle blood circulation. Its active components can dilate the capillaries of the scalp, increase the blood supply to the hair follicles, and provide sufficient nutrients for the dermal papilla cells; second, it activates dermal papilla cells. In vitro experiments show that Cistanche extract can improve the proliferation activity of dermal papilla cells, up-regulate the expression of vascular endothelial growth factor (VEGF), and promote the transformation of hair follicles from telogen to anagen; third, it has anti-inflammatory and antioxidant effects. For the scalp inflammation associated with seborrheic alopecia, Cistanche components can inhibit the release of inflammatory factors, reduce scalp inflammation, and at the same time scavenge scalp ROS and reduce hair follicle damage.
Clinical studies have shown that after 3 months of external use of the hair growth tincture containing Cistanche extract, the hair growth density in the hair loss area of the subjects increased by 30% - 40%, the hair diameter increased by 15%, and the symptoms such as scalp itching and greasiness were significantly improved.
4 Development Status and Technical Bottlenecks of External Cistanche Preparations
At present, external health care preparations of Cistanche have formed a diversified product form, but their development still faces technical bottlenecks such as the stability of active components and skin penetration efficiency, which restrict the full play of their efficacy.
4.1 Current Status of Preparation Development
Based on different application scenarios, external Cistanche preparations are mainly divided into three categories: first, reproductive health products, such as gels and creams. Most of these preparations take Cistanche extract as the core component, and are made with humectants and penetration enhancers (such as propylene glycol and azone), focusing on mild and non-irritating properties; second, skin care products, such as lotions and serums, which are often compounded with ingredients such as hyaluronic acid and vitamin E to enhance moisturizing and anti-aging effects; third, hair care products, such as tinctures and shampoos, which are mostly combined with traditional Chinese medicine ingredients such as Platycladus orientalis leaves and Polygonum multiflorum to improve hair growth and care effects.
Most Cistanche external products on the market use "natural herbal" as a selling point, but the content of active components varies greatly, and some products lack clear quality standards, resulting in insufficient efficacy stability.
4.2 Core Technical Bottlenecks
The development of external Cistanche preparations mainly faces two major technical problems: first, the poor stability of active components. Phenylethanoid glycosides are easily oxidized and degraded during the storage of preparations, leading to reduced efficacy; second, the limited skin penetration efficiency. The active components of Cistanche have large molecular weights, and it is difficult to achieve efficient penetration by relying solely on traditional penetration enhancers, which limits their effects in deep tissues such as the dermis and hair follicles.
To solve the above problems, current research mostly adopts new preparation technologies for optimization. For example, carrier technologies such as microemulsions and nanoparticles are used to encapsulate active components, which not only improves their stability, but also enhances the skin absorption efficiency through the penetration effect of the carrier; in addition, physical auxiliary methods such as ultrasonic penetration enhancement and iontophoresis are also used to enhance the skin penetration effect of Cistanche components. Relevant technologies have entered the laboratory stage, but have not yet achieved industrial application.
5 Safety Evaluation and Application Suggestions of External Cistanche
天然植物成分并非绝对安全，肉苁蓉外用的安全性需从皮肤刺激性、致敏性及长期使用影响等方面综合评估，为其规范化应用提供依据。Natural plant components are not absolutely safe. The safety of external Cistanche needs to be comprehensively evaluated from aspects such as skin irritation, sensitization, and long-term use effects, so as to provide a basis for its standardized application.
5.1 Safety Evaluation
Acute skin irritation experiments show that when Cistanche extract (concentration ≤ 10%) is used externally, there are no irritating reactions such as redness and exudation on the skin of rabbits, and the skin irritation index is 0, which is a non-irritating substance; in skin sensitization experiments, the sensitization rate of guinea pigs is 0, indicating that it has no sensitization. Long-term use safety studies show that after 3 months of continuous external use of preparations containing 5% Cistanche extract, the liver and kidney functions and blood routine indicators of the subjects are normal, and no adverse reactions such as skin pigmentation and atrophy occur, confirming that it has high safety for long-term external use.
It should be noted that Cistanche is warm in nature, and should be avoided when the skin is damaged or in the acute inflammation stage, so as not to aggravate local reactions; those who are allergic to Orobanchaceae plants should be prohibited from using it.
5.2 Application Suggestions
Based on the efficacy characteristics and safety of external Cistanche, the following application suggestions are put forward: first, choose appropriate preparations according to needs. For reproductive health, choose mild and non-irritating gels; for skin anti-aging, choose lotions or serums; for hair care, choose tinctures or shampoos; second, pay attention to product quality, and choose regular products with clearly marked Cistanche active component content (such as acteoside ≥ 1%); third, standardize the use method, follow the product instructions, avoid excessive use, and people with sensitive skin should conduct an earlobe skin test before first use; fourth, special groups should use it with caution. Pregnant men, lactating men and children should use it under the guidance of a doctor.
6 Conclusion and Prospect
The phenylethanoid glycosides, polysaccharides and other active components in Cistanche have multiple effects such as antioxidation, anti-inflammation, and promotion of cell proliferation, and have shown significant application value in external health care scenarios for men, such as reproductive health maintenance, skin anti-aging, and hair care. Existing studies have confirmed its effectiveness and safety for external use, providing a scientific basis for product development. However, the current external Cistanche preparations still have problems such as insufficient stability of active components and limited skin penetration efficiency. Moreover, relevant studies are mostly focused on in vitro experiments and short-term clinical observations, and the long-term mechanism of action and industrialization technology still need further exploration.
In the future, the development of Cistanche in the field of external health care for men should be promoted from three aspects: first, strengthen basic research, deeply clarify the external action mechanism of its active components, and clarify the dose-effect relationship; second, break through technical bottlenecks, adopt new carrier technologies and preparation processes to improve the stability of active components and skin penetration efficiency; third, establish a standardization system, formulate quality standards and application specifications for external Cistanche preparations, and promote the standardized development of the industry. With in-depth research and technological innovation, Cistanche, as a natural plant-derived component, is expected to achieve wider application in the field of external health care for men.
