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Withania somnifera, commonly known as Ashwagandha, is a revered adaptogenic herb in traditional Ayurvedic medicine, renowned for its ability to enhance the body's resilience to stress and anxiety. Modern scientific research has supported its potential role in alleviating symptoms of chronic stress and anxiety disorders. The active compounds in Withania somnifera, particularly withanolides, have been shown to regulate cortisol levels, the primary stress hormone, while also influencing neurotransmitters such as GABA, serotonin, and dopamine, which are critical in mood regulation. Clinical studies suggest that Ashwagandha supplementation can significantly reduce perceived stress, anxiety, and the physiological effects associated with chronic stress, such as increased heart rate and blood pressure. Furthermore, Ashwagandha’s neuroprotective and anti-inflammatory properties may contribute to improving mental well-being by reducing oxidative stress, which is linked to mood disorders. Despite its promising effects, further research is needed to fully understand the mechanisms by which Withania somnifera exerts its therapeutic effects on stress and anxiety. However, the current evidence supports its potential as a natural, adjunctive treatment for individuals seeking to manage stress and anxiety more effectively.
The presence of high-value secondary metabolites in plant-based bio actives, which offer health advantages, has researchers increasingly interested these days. Given the state of global healthcare today, more than 80% of the global populace, especially in developing nations that rely on phytomedicines for their medicinal requirements (1). The continued success of conventional systems of treatments like Ayurveda, Chinese medicine, and Greco-Arab (UnaniTibb) techniques is because that phytomedicines are less harmful and are cost-effective (2-4). It is widely acknowledged that plants of the Solanaceae family's genus Withania are essential for medicine because of their high therapeutic and nutraceutical possible. One of the genus's plants, W. somnifera. (Figure 1), which had numerous medical uses together with pharmaceutical uses. W. somnifera, sometimes known as Winter cherry, Indian ginseng, suranjan, in Africa. Pakistan, India, Sri Lanka, and the Mediterranean (5–9). In the medicinal system of Ayurveda, roots and Plant leaves were thought to be phytotherapeutic drugs to treat a variety of illnesses. Different clinical and Preclinical studies showed that the herb could cure neurological conditions (11) hepatotoxicity (10), and anxiety Parkinson's disease (13).
Huntington disease (12) (2, 14). Significant levels were present in the fruits of saponins and the leaves. Withanolides, pharmacologically active steroidal lactones, were found in W. somnifera through phytochemical study (16, 17). 38% of the weight of alkaloids is made up of withanine, a class of alkaloids that were separated from the plant's roots (18). The main withanolides that were isolated from W. somnifera in India were withanolide D and withaferin A, both of which had cytotoxic and anticancer effects (19). Along with alkaloids, the plant also included glycosides, flavonoids, phenolics, steroids, saponins, and phytophenols (20–23). It is also frequently utilized as an antipyretic, analgesic, adaptogenic, and anti-inflammatory drug in formulations used in traditional medicine (5, 24). A few review papers addressing other facets of W. somnifera have been published in the literature (25, 26). To assess the state of the art with regard to the phytochemical composition, therapeutic uses, and nutraceuticals of the miraculous plant W. somnifera, a thorough review is still required.
We focused mostly on the multipurpose plant's preclinical studies, toxicity, and clinical trials. This review will assist in filling in the knowledge gaps about phytochemicals, medicinal chemists, and pharmacologists regarding the medicinal uses and pharmaceutical applications of the beneficial plant. The review evaluated recent research on the high-value uses of plant material in pharmacy and medicine.
Phytochemicals present in W. Somnifera:
Plants that are abundant in phytochemicals, including terpenoids, alkaloids, and steroids, which have been used historically in food and traditional medicine (27–30). By isolating withaniol, somnirol, somnitol, withanic acid, phytosterol, ipuranol, and alkaloids from alcoholic extracts of leaves and roots, Power and Salway began phytochemical investigations of W. somnifera in 1911 (31). In the aforementioned investigation, alkaloids were identified and dubbed somniferine, somniferinine, withamine, withanmine, pseudowithamine, and withanaminine (32). Several phytochemicals, including tropine, choline, pseudotropine, dl-isopelletierine, cuscohygrine, anahygrine, and anaferine, were shown to be present in the plant's alcoholic extract (33). Moreover, the alcoholic root extract of W. somnifera was shown to contain withasomnine, a pyrazole alkaloid (34). In 1980, it was reported that a methanolic extract of the plant leaves contained tisopelletierine, 3α-tigloyloxtropine, cuscohygrine, 3-tropyltigloate, hygrine, isopelletierine, withasomnine, mesoanaferine, withanine, somniferine, hentriacontane, withananine, visamine, ashwagandhine, and pseudowithanine (35). Additionally, withaniol, reducing sugars, acylsterylglucosides, ducitol, starch, hantreacotane, iron, and amino acids such aspartic acid, proline, tyrosine, alanine, glycine, glutamic acid, cysteine, and tryptophan were found in the plant's methanolic extract (20, 21, 36). Fast Atom Bombardment-Mass Spectrometry, 13C and 1H nuclear magnetic resonance (NMR), and UV-visible spectroscopy techniques were used to confirm the structures of seven novel withanosides I–VII that were isolated from a methanolic extract of the plant root (21).
Steroid lactones known as withanolides made up the methanolic extract (37–39). With the exception of the hydroxyl group at C-20 rather than C-27, withanolide D, which was separated from the alcoholic extract of leaves, showed structural similarities to withaferin A (39).
It is actually 22-hydroxyergostane-26-oic-26,22 olide with novel structural variations at a carboxylic skeleton or side chains that make up 0.001-0.5% of the total dry weight of leaves and roots (41). Depending on their geographic distribution, distinct chemotypes of W. somnifera contained varying amounts of substituted steroidal lactones (15, 16, 32, 39, 42).
Withanolide D was mostly found in chemotype-II, which was distinguished by structural change at C-20 with an epoxy system at positions 5 and 6 and a hydroxyl group at position 4. Withanolides E and J, in contrast to other withanolides, had an OH group at C-17 rather than C-20, according to structural characterisation. While withanolides G and J had conventional β-orientation of side chains, withanolides E and F had α-orientation (44). Each chemotype's substituted steroidal lactones were a result of genetic polymorphisms (36) and a thorough analysis of the chemotypes revealed varying steroidal contents (45–50).
Fig.2: Representational image of Huntington’s Disease
The alcoholic extract of roots (51) included withanolide A, which was identified as 4β,27-dihydroxy-1oxo-5β,6β-epoxy with a-2,24-dienolide (52). Likewise, the plant's isolated withanolide C has 5 and 6β epoxide rings with a chloro-group at C-5(53). An aqueous preparation of the entire plant yielded withanone and tubacapsenolide along with six of its derivatives (54).2-mercaptoethanol with 5 and 6β epoxy steroids confirmed the occurrence of 2-en 1-one with a steroid bearing an epoxy group at positions 6 and 7 in spectroscopic investigations (55). In contrast to withanolide R (56), which lacked an OH group at C-27, withanolide Q has a hydroxyl group at C-23. With the exception of the secondary axial hydroxyl moiety and absence of an epoxide ring, withanolide S, which was isolated from the alcoholic extract of leaves during a biogenetic investigation, shared structural similarities with withanolide E. In addition to the well-known withanolides D, E (16, 39), and P (57), two new withanolides N and O (45) were found in the alcoholic extract of plant leaves. According to quantitative analysis, withaferin A makes about 1.6% of the leaves' total dry weight (58).
Following ethanol extraction, the plant's leaves were examined (59). Pseudotropine, cuscohygrine, isopelletierine, dl-isopelletierine-3-tropyltigloate, anaferine, hygrine, anahygrine, somniferine, mesoanaferine, 3α-tigloyloxtropine, choline, withanine, visamine, withananine, hentriacontane, and withasomnine, as well as pyrazole derivatives, pseudowithanine, and ashwagandhine, were identified as a number of dragendorff positive alkaloids. Using spectral studies, it was determined that the methanolic extract of shade-dried aerial parts contained diepoxy withanolide, withaferin A, and chlorinated withanolide (27-acetoxy-4β,6α-dihydroxy-5β-chloro-1-oxowitha2,24-dienolide), which demonstrated anti-cancerous potential against human lung cancer (NCI-H460 cell line) (60). From chemotype III, steroidal lactones, withanolide G, and Δ16-withanolide (61-63) were separated. Using spectroscopic methods and X-ray crystallographic analysis, the entire plant extracted with equimolar ratios of water and methanol was examined and found to contain nine known withanolides, including (22R)-5β-formyl-6β,27 dihydroxy-1-oxo-4-norwith-24-enolide, 6α-chloro-5β hydroxywithaferin A, 2,3-dihydrowithaferin A, withaferin A, withanone, 3-methoxy-2,3-dihydrowithaferin A, withanoside IV, 2,3-didehydrosomnifericin, and withanoside X. An analysis of the plant's ethanol extract revealed that it contained sominone, isosominolide, and asomniferin A (64, 65). As is typical of most withanolides, withasomidienone, which was separated from the plant's methanolic root extract, displayed three double bonds at positions 1, 4, and 24 (68).Withaoxylactone and somnifericin were extracted from the plant and described using a variety of methods in a different study. The presence of four epoxy groups at various locations in withaoxylactone (5, 6, 14, and 15 places) and somnifericin (4, 5, 6, and 27 positions) was revealed (69). An ethanolic extract of stem bark was found to contain five unique withanolides, including withasomnilide, somniferanolide, somnferawithanolide, and withasomniferanolide, according to another experiment.
Fig.3: Represents gene protein linkage of neurodegeneration of HD
Withania somniferanolide, somnifera withanolide, and somniwithanolide do not contain epoxy groups, according to additional analysis (70).In a similar manner, three novel withanolides were identified, including withasomniferol A, withasomniferol B, and withasomniferol C from root extracts in benzene and ethyl acetate (71).4-Isolated from alcoholic fruit, deoxywithaperuvin Spectral analysis was used to characterize the extract and discovered Five hydroxyl moieties are present at positions 5, 6, 14, 17, and 20positions) (72).
The alcoholic extract contains viscosalactone B examined the entire facility as a structural Withaferin analog containing an epoxy group at position six and three hydroxyl groups, seven locations, and a double bond at C-24 groups on the carbon skeleton at positions 3, 4, and 27 (73).The identification of withanolide Y was 5α, 6α-epoxy-7α, 17α,Utilizing 20R-trihydroxy-1-oxo-22R-witha-2, 24-dienolide XRD on a single crystal (74).
To isolate the phytochemicals, the plant's roots were extracted using petroleum ether and acetone. β-sitosterol and d-glycoside were shown to be present using a variety of chromatographic and spectroscopic methods (75).
50 g of W. somnifera powder and 500 ml of distilled water were subjected to subcritical water extraction of withanolides at 40 °C. After lyophilizing the extract, high-performance liquid chromatography and Soxhlet were used to separate the withanolides.
The findings demonstrated that the real biological components in charge of the different biological actions were withanoside IV, 12-Deoxywithastramonolide, withaferin A, and withanolide A (76). Caffeic, ferulic, and benzoic acids, as well as withaferin A, withanone, and withanolide A, were extracted from W. somnifera root, stem, and leaves using methanolic and chloroform extracts at a concentration of 4.0 g per plant component (77).
GC-MS analysis of various oil extracts from W. somnifera berries revealed saturated and unsaturated fatty acids such as linoleic acid (11.247%), palmitic acid (2.842%), linoleic acid (4.000%), tetracosanoic acid (0.880%), palmitic acid (0.42%), elaidic acid (0.01%), linoleic acid (0.23%), and oleic acid (0.14%) (95). The extracts contained nine withanolides: 27-hydroxy withanone, 17-hydroxy-27-deoxy withaferin A, 17-hydroxy withaferin A, withanolide D, withaferin A, withanolide A, 27-hydroxy withanolide B, withanone, and 27-deoxywithaferin A (77).
Folk Medicinal Uses:
The plant's many parts, including leaves, roots, blossoms, bark, and stem, have traditionally been used to treat heart problems, pain, liver disorders, fever, respiratory infections, wounds, ulcers, and sex-related ailments (112-113). The therapeutic capacity of plants utilized in ancient medicinal systems (Unani and Ayurvedic) was attributed to bio actives such as alkaloids, steroids, phenolics, flavonoids, and so on (2,113). Among other plants in the Withania genus, W. somnifera is high in the aforementioned bio actives, making it the preferred choice of folk healers (114-117).
Pharmacological attributes:
Antifungal and Antimicrobial activities:
The plant also inhibited bursal disease virus in a cytopathic effect reduction experiment (117). Monomeric glycoprotein extracted from the plant's root tuber suppressed the growth of fungi like Fusarium oxysporum, Aspergillus flavus, and Fusarium verticilloides, as well as bacteria like Clvibacter michiganensis subsp. michiganensis (123). The bactericidal potential of aqueous and alcoholic root extracts was assessed using the agar well diffusion experiment. The butanolic subfraction of the plant's methanolic root/leaf extract exhibited significant antibacterial potential against Salmonella typhimurium, whereas oral administration of W. somnifera's aqueous leaf/root extract exhibited bacteriostatic effect against S. typhimurium similar to chloramphenicol, the standard drug (124). The plant's leaf, root, and stem extracts were tested for bactericidal activity against six bacterial strains (Staphylococcus aureus, Bacillius subtilis, Escherichia coli, Raoultella planticola, Pseudomonas aeruginosa, Enterobacter aerogens) and fungistatic activity against Candida albicans and A. flavus using serial dilution and disc diffusion methods. The aqueous leaf extract had the strongest activity against R. planticola, whereas the others had intermediate antibacterial and fungistatic properties (150-152). Several plant extracts and isolated chemicals showed promise as antibacterial and antifungal agents (164). In another study, the plant's leaves and roots were extracted with methanol, diethyl ether, and n-hexane and tested for antibacterial activity against S. typhimurium and E. coli using an agar plate diffusion assay. The methanol and hexane-based extract demonstrated significant antibacterial activity. Tibrim's antibacterial activity increased significantly when combined with plant extracts in methanol and hexane (165). A 10 μg/ml concentration of methanolic root extract inhibited E. coli and Enterococcus species growth (97). The methanolic extract of roots, leaves, and bark inhibited the development of Gram-positive (S. aureus) and negative (E. coli) bacterial strains at concentrations ranging from 10-100 μg/mL. Methanoic extracts from roots and leaves were tested against fungi such A. flavus, D. turcica, and F. verticillioides at a concentration of 100 µg. Nystatin was used as a positive control.
The zone of greatest inhibition against fungal strains was observed to be between 7 and 14 mm (166). A methanolic extract of the leaves inhibited the growth of Enterococcus species and S. aureus at a concentration of 1-2 mg/ml (167).
Acetone, methanol, ethanol, and chloroform extracts of plant roots showed significant microbicidal activity against S. aureus and K. pneumonia (168).
The plant extracts (leaf, stem, and root) were tested for antifungal activity against F. crown at a concentration of 100 mg/100 ml solvent.
Aqueous and organic solvent extracts of the plant showed significant suppression at 5-45 mm compared to the positive control, dimethyl sulfoxide (DMSO) (169).
Antidote activity:
Snake venom consists of myo, neuro, cyto, and enzymatic-toxins (155). Recently, antidote properties of W. somnifera are reported against toxicity induced by arsenic (115).
Hyaluronidases enzymes present in snake venom helped the dispersal of toxins in the extracellular matrix of the tissues in victims. A glycoprotein from W.somnifera inhibited hyaluronidase in the venom of Naga raja (cobra) and Daboia russelii (viper) when tested using the zymogram assay. The extracts also inhibited the activity of phospholipase A-2, an enzymatic toxin found in cobra venom (156,170).
Another study found that an aqueous extract of W. somnifera (whole plant) reduced the harmful effects of PLA-2 caused by Naja raja venom (171).
Pesticidal and larvicidal activity:
Aqueous, methanol, and n-hexane extracts of roots and shoots (5, 10, 15, and 20% weight and volume) were tested against Phalaris minor in crops. Aqueous sprouts and root extracts have much higher herbicidal efficacy against P. minor than other solvent extracts (116). Root and shoot extracts in methanol, water, and n-hexane had considerable herbicidal efficacy. Parthenium hysterophorus germination and seedlings were found to be reduced after applying aqueous and methanolic extracts by foliar spray or soil (133).
Withania somnifera (Ashwagandha) has a number of phytochemicals that contribute to its capacity to relieve stress and anxiety. These bioactive chemicals function through a variety of pathways, which contribute to their adaptogenic capabilities. Here are the primary compounds present in Ashwagandha that help to alleviate stress and anxiety:
Withanolides:
Withanolides, the primary bioactive components in ashwagandha, are a type of naturally occurring steroid.
They exhibit anti-inflammatory, antioxidant, and neuroprotective effects. Withanolides modulate the stress response by lowering cortisol (the stress hormone) levels, and they can also protect the brain and nervous system from stress-related damage.
Withaferin A, a kind of withanolide, has been investigated for its capacity to lower anxiety and improve mood by altering the activity of GABA receptors, which are important in calming the nervous system.
Alkaloids:
Ashwagandha includes numerous alkaloids, including somniferine, anaferine, and tropine.
These alkaloids are thought to operate as calming agents on the central nervous system, reducing symptoms of anxiety and encouraging relaxation.
Saponins:
Ashwagandha saponins, including withanosides, have adaptogenic and antioxidant effects. They assist the body deal with physical and emotional stress.
Saponins also help the immune system and improve the body's ability to recuperate from stress by lowering inflammation and oxidative stress levels.
Flavonoids:
Ashwagandha contains flavonoids, which are well known for their antioxidant properties.
These compounds help to reduce oxidative stress, which is caused by chronic anxiety or stress. Flavonoids help to maintain overall health and a healthy stress response by protecting cells from oxidative damage.
Triterpenoids:
Ashwagandha contains triterpenoids, which have anti-inflammatory and neuroprotective properties.
These substances may help balance the body's reaction to stress by protecting the brain and neurological system from the negative effects of prolonged stress.
Fatty acids:
Ashwagandha contains a variety of fatty acids, including linoleic and oleic acid, which are essential for brain health.
These fatty acids aid to improve the structure and function of the nervous system, boosting mental clarity, attention, and reducing anxiety.
Iron:
Ashwagandha includes iron, which can help boost energy and alleviate fatigue, a typical side effect of prolonged stress.
Acetylglucosamine:
Acetylglucosamine is another molecule in Ashwagandha that supports the neurological system and helps neurons stay healthy, potentially helping to reduce stress-induced brain damage.
Mechanism of action for stress and anxiety:
Cortisol regulation: One of Ashwagandha's most well-studied benefits is its ability to regulate cortisol levels, which rise during times of stress. Lowering cortisol helps to alleviate the physical and mental symptoms of stress and anxiety.
GABA modulation: Ashwagandha can interact with GABA receptors, which help to reduce hyperactive brain activity and promote feelings of calm and relaxation.
Neurogenesis: Ashwagandha has been proven to promote neurogenesis, which aids in the healing and regeneration of nerve cells, particularly in areas of the brain involved in emotional regulation and memory, such as the hippocampus.
CONCLUSION:
Withania somnifera, also known as Ashwagandha, has emerged as a powerful and widely utilized plant in the field of natural stress and anxiety relief. Its lengthy history in traditional medicine, notably Ayurvedic techniques, has paved the way for its modern-day use in promoting mental health. The herb's potential to serve as an adaptogen is one of the primary factors that contribute to its efficacy in stress management. Adaptogens are compounds that assist the body resist and adapt to various types of stress, both physical and mental, by balancing physiological systems and promoting homeostasis.
Withania somnifera's principal bioactive components, particularly withanolides, play an important function in stress reduction. Withanolides help to regulate cortisol levels, which are usually raised in response to stress. Cortisol levels can have a variety of negative effects, including increased anxiety, exhaustion, and reduced cognitive performance. Ashwagandha reduces the body's stress response by moderating cortisol secretion, promoting calmness and mental clarity. This makes it a natural alternative to synthetic anti-anxiety drugs, which are frequently associated with negative side effects.
Beyond cortisol modulation, Withania somnifera has a variety of bioactive components, including alkaloids, saponins, flavonoids, and fatty acids, which work together to promote mental wellness. Alkaloids such as somniferine contribute to Ashwagandha's relaxing effects, whereas saponins improve the body's ability to cope with stress by strengthening the immune system and lowering inflammation. Flavonoids, with their antioxidant capabilities, protect the brain from oxidative stress, thereby promoting cognitive performance and mood stability. Furthermore, the fatty acids in Ashwagandha have neuroprotective properties, which protect brain cells from stress-induced damage.
Ashwagandha's impact on mental health extends beyond its physiological benefits. The herb has been found to improve the body's stress resistance by stimulating neurogenesis, particularly in parts of the brain involved in emotional regulation, such as the hippocampus. This nerve regeneration process promotes emotional equilibrium and aids the brain's recovery from the negative effects of chronic stress. Furthermore, Ashwagandha's capacity to interact with GABA receptors, which play an important role in relaxing brain activity, enhances its ability to produce relaxation and alleviate anxiety symptoms.
Numerous scientific investigations and clinical trials have shown that Ashwagandha is effective in lowering both psychological and physiological symptoms of stress and anxiety. Many people who have incorporated Ashwagandha into their daily routines report a significant reduction in anxiety, improved mood, and general emotional well-being. The herb's moderate yet effective approach to stress management, combined with its low risk of side effects, has made it a popular choice among those looking for a natural solution to their mental health issues.
In conclusion, Withania somnifera is an effective natural therapy for stress and anxiety. Its unique combination of phytochemicals, mainly withanolides, alkaloids, and saponins, works together to control the body's stress response, reduce anxiety, and improve emotional resilience. Ashwagandha's adaptogenic, neuroprotective, and relaxing characteristics provide a comprehensive approach to addressing the consequences of chronic stress and anxiety. As further study is conducted to uncover its full range of advantages, Withania somnifera is positioned to remain a vital and trusted ally in boosting mental health and wellness. Ashwagandha, whether taken alone or as part of a larger health regimen, is a natural, effective alternative for people looking to restore balance and tranquillity in their life in the face of modern stressors.
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Praveen Raja S
Corresponding author
Faculty of Pharmacy, SBMCH Campus, BIHER (DU), Chennai, Tamil Nadu, India
Praveen Raja S, Sri Dharshan K, Kalaivani D, Keerthana M, Overview of Bioactive Phytochemicals in Withania somnifera Relieving Stress and Anxiety on Cum- Huntington Disease, Int. J. of Pharm. Sci., 2025, Vol 3, Issue 11, 3341-3357. https://doi.org/10.5281/zenodo.17672594
10.5281/zenodo.17672594
