Shilajit vs Ashwagandha: Differences, Benefits and Which to Take
Shilajit and ashwagandha are both popular adaptogens, but they do different things. Shilajit is primarily used for energy, mineral absorption and physical stamina. Ashwagandha is primarily used for stress, anxiety and sleep. If your goal is one of those specifically, choose accordingly. If you want both energy and stress support, a combination formula containing both ingredients covers both bases.
Why Are People Comparing Shilajit and Ashwagandha?
Shilajit and ashwagandha are two of the most searched natural supplements in the UK, and they come up together frequently because they share some surface-level similarities. Both have roots in Ayurvedic tradition, both are classified as adaptogens, and both are marketed for energy, performance and general wellbeing. But they work through completely different mechanisms and are suited to different goals.
This guide compares them head-to-head across the areas that matter most: energy, stress, sleep, physical performance, hormonal health and cognitive function. It also covers the research behind each one and explains when it makes sense to take them together.
What Is Shilajit?
Shilajit is a dark, resinous substance that forms over centuries from the slow decomposition of plant material in mountain rock, primarily in the Himalayas. Its key active compound is fulvic acid, a natural organic acid that acts as a carrier molecule, helping the body absorb minerals and other nutrients more efficiently.
Shilajit also contains over 80 trace minerals in ionic form, which means they are already in a state the body can readily use. Its primary mechanisms of action relate to mitochondrial energy production and mineral delivery, which is why it is most commonly associated with physical energy, stamina and recovery.
What Is Ashwagandha?
Ashwagandha (Withania somnifera) is a plant whose roots contain active compounds called withanolides. These interact with the hypothalamic-pituitary-adrenal (HPA) axis, the system that controls the body's stress response. By modulating cortisol and other stress hormones, ashwagandha helps the body manage physical and mental stress more effectively.
The most clinically studied form is KSM-66, a full-spectrum root extract with a standardised withanolide content. KSM-66 has been used in the majority of recent clinical trials on ashwagandha. For a detailed look at the evidence, see our guide to ashwagandha benefits.
Shilajit vs Ashwagandha: Compared by Goal
Energy and Stamina
Shilajit is the stronger choice for energy. It supports mitochondrial function directly by enhancing the production of ATP (adenosine triphosphate), the molecule that powers cellular energy. A study published in the Journal of Ethnopharmacology found that shilajit supplementation increased ATP production in muscle tissue and reduced fatigue markers in animal models (Surapaneni et al., 2012, DOI: 10.1016/j.jep.2012.06.002).
Ashwagandha can improve perceived energy by reducing the fatigue that comes from chronic stress, but it does not act on energy production at the cellular level in the same way.
Better for energy: Shilajit
Stress and Anxiety
Ashwagandha is the clear winner for stress and anxiety. A landmark trial by Chandrasekhar et al. (2012) found that 600mg of KSM-66 ashwagandha daily reduced cortisol levels by 27.9% and significantly lowered stress and anxiety scores compared to placebo over 60 days (DOI: 10.4103/0253-7176.106022).
Shilajit does not have a meaningful direct effect on stress hormones or anxiety pathways.
Better for stress: Ashwagandha
Sleep
Ashwagandha has direct evidence for improving sleep. A study by Langade et al. (2019) found that ashwagandha root extract improved both sleep quality and sleep onset latency in adults with insomnia (DOI: 10.1371/journal.pone.0226220). This is likely mediated through its cortisol-lowering and anxiolytic effects.
Shilajit has no significant evidence for sleep improvement.
Better for sleep: Ashwagandha
Physical Performance and Muscle Strength
Both supplements have evidence here, through different mechanisms. Ashwagandha has been shown to improve muscle strength and recovery. A trial by Wankhede et al. (2015) found that ashwagandha supplementation significantly increased muscle strength and size, and improved recovery in resistance-trained men over 8 weeks (DOI: 10.1186/s12970-015-0104-9).
Shilajit contributes to physical performance through improved energy production and mineral delivery, supporting endurance and recovery from a different angle. A pilot study found that shilajit supplementation helped maintain muscular strength following fatiguing exercise (Keller et al., 2019, DOI: 10.1186/s12970-019-0270-2).
Better for performance: Both contribute (ashwagandha for strength, shilajit for endurance)
Testosterone and Male Health
Both shilajit and ashwagandha have preliminary evidence for supporting healthy testosterone levels. A clinical study found that purified shilajit taken for 90 days significantly increased total testosterone levels in healthy men aged 45-55 (Pandit et al., 2016, DOI: 10.1111/and.12482). Ashwagandha has also shown positive effects on testosterone in the context of resistance training and stress reduction.
Neither should be positioned as a testosterone treatment, but both have enough evidence to suggest a supportive role in male reproductive health.
Better for testosterone: Tie (both have evidence)
Cognitive Function
Ashwagandha has more direct evidence for cognitive benefits. Studies have shown improvements in reaction time, task performance and memory, likely mediated through its stress-reducing effects (Choudhary et al., 2017, DOI: 10.1016/j.jep.2017.09.048). Shilajit may support brain health through its fulvic acid content and mineral delivery, but the clinical evidence is thinner.
Better for cognitive function: Ashwagandha
Comparison Table
| Shilajit | Ashwagandha | |
|---|---|---|
| Type | Mineral-rich resin | Adaptogenic herb (root extract) |
| Key compound | Fulvic acid + 80+ trace minerals | Withanolides |
| Primary benefit | Energy and mineral absorption | Stress and anxiety reduction |
| Secondary benefits | Stamina, testosterone support, recovery | Sleep, muscle strength, cognition |
| Mechanism | Mitochondrial ATP production, mineral delivery | HPA axis modulation, cortisol reduction |
| Research base | Growing (moderate) | Strong (multiple RCTs with KSM-66) |
| Best studied form | Purified shilajit extract | KSM-66 root extract |
| Best for | Low energy, physical endurance, mineral support | Stress, anxiety, sleep, recovery |
Can You Take Shilajit and Ashwagandha Together?
Yes, shilajit and ashwagandha can be taken together safely. Because they work through entirely different mechanisms (mitochondrial energy vs HPA axis modulation), they complement each other rather than overlap. There are no known adverse interactions between the two.
Taking both makes sense if you want energy and stamina support alongside stress management and better sleep. Rather than buying two separate supplements, Supplements Wise offers a Shilajit Complex that combines shilajit with ashwagandha and rhodiola rosea in a single capsule. This covers energy, stress and immune support in one daily formula.
Which Supplements Wise Product Is Right for You?
If your main concern is stress, anxiety or sleep: Ashwagandha KSM-66 Capsules (500mg) provide the most clinically studied form of ashwagandha in a straightforward capsule format. KSM-66 is the extract used in the majority of published trials on stress and cortisol reduction.
If you prefer a more convenient format: Ashwagandha Gummies (600mg) deliver a generous daily dose in a natural raspberry flavour. A good option if you find capsules difficult to take or simply prefer gummies.
If you want energy, stress support and mineral delivery in one product: Shilajit Complex combines shilajit, ashwagandha and rhodiola rosea. This is the most comprehensive option if you do not want to take multiple supplements separately.
Browse the full ashwagandha and adaptogen range to see all available options.
Frequently Asked Questions
Is shilajit better than ashwagandha?
Neither is universally better. Shilajit is more effective for energy, stamina and mineral absorption because it works at the mitochondrial level to support ATP production. Ashwagandha is more effective for stress, anxiety and sleep because it modulates the HPA axis and reduces cortisol levels. The best choice depends on your primary health goal.
Can you take shilajit and ashwagandha together?
Yes, shilajit and ashwagandha can be taken together safely. They work through different biological mechanisms (mitochondrial energy production vs stress hormone regulation) and complement each other rather than overlap. Many people take both for combined energy and stress support. Combination supplements containing both ingredients are also available.
What does shilajit actually do?
Shilajit is a mineral-rich resin containing fulvic acid and over 80 trace minerals. Its primary effects are supporting mitochondrial energy production (ATP synthesis) and improving mineral absorption. This translates to increased physical energy, improved stamina and better recovery from exercise. There is also preliminary evidence that shilajit may support healthy testosterone levels in men.
How long does ashwagandha take to work?
Most clinical trials on ashwagandha show measurable effects after four to eight weeks of consistent daily use. Some people report improvements in stress and sleep quality within two to three weeks, but the full benefits, particularly for cortisol reduction and physical performance, typically require at least 60 days of supplementation.
Is shilajit safe to take daily?
Purified shilajit extract is generally considered safe for daily use at recommended supplement dosages. The key word is purified. Raw, unprocessed shilajit can contain heavy metals and contaminants, so it is important to use a supplement that has been properly processed and tested. People with gout or high uric acid levels should consult a doctor before taking shilajit, as it contains purine compounds.
Which is better for testosterone, shilajit or ashwagandha?
Both shilajit and ashwagandha have clinical evidence supporting modest increases in testosterone levels. Shilajit showed significant testosterone increases in men aged 45-55 over 90 days in a published clinical study. Ashwagandha has shown testosterone benefits particularly in the context of resistance training and stress reduction. Neither is a hormone replacement, but both may provide supportive benefits for male reproductive health.
Summary
Shilajit and ashwagandha are both effective adaptogens, but they serve different purposes. Shilajit is the better choice if your primary goal is energy, stamina or mineral support. Ashwagandha is the better choice if you are dealing with stress, anxiety or poor sleep. For physical performance and testosterone support, both have evidence and they work well together.
If you want the benefits of both without taking multiple supplements, Supplements Wise Shilajit Complex combines shilajit, ashwagandha and rhodiola in a single daily capsule. For pure ashwagandha, our KSM-66 capsules and ashwagandha gummies are both available. Browse the full range here.
