Ashwagandha vs Shilajit: Which One Should You Actually Take?
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Short answer: they are not competitors, and the choice depends entirely on what's actually bothering you. Ashwagandha has the stronger human evidence for stress, sleep and anxiety. Shilajit has the single most convincing testosterone trial of the two. They work through completely different mechanisms — one calms an overactive stress axis, the other supports cellular energy production — which is why "take both" is often the honest answer rather than a sales tactic.
What follows is a comparison of what each herb is genuinely supported by, where the evidence is thinner than the marketing suggests, and how to decide between them. We sell formulations containing both, so we've been deliberate about labelling the strength of the evidence at every point — including where it's weak.
Ashwagandha vs Shilajit at a Glance
| Factor | Ashwagandha | Shilajit |
|---|---|---|
| What it is | AshwagandhaRoot extract of Withania somnifera, a shrub | ShilajitMineral-rich resin that seeps from Himalayan rock |
| Active compounds | AshwagandhaWithanolides | ShilajitFulvic acid and humic substances |
| Ayurvedic classification | AshwagandhaRasayana — rejuvenative | ShilajitRasayana — rejuvenative |
| Main mechanism | AshwagandhaRegulates the stress axis; lowers cortisol | ShilajitSupports mitochondrial energy production |
| Strongest evidence for | AshwagandhaStress, anxiety, sleep quality | ShilajitTestosterone in middle-aged men |
| Typical studied dose | Ashwagandha300–600 mg/day of root extract | Shilajit250–500 mg/day of purified resin |
| Usual timeframe | Ashwagandha4–8 weeks | Shilajit8–12 weeks |
| Best taken | AshwagandhaEvening, or split morning and night | ShilajitMorning |
What Is Ashwagandha?
Ashwagandha is an extract of the root of Withania somnifera, a low evergreen shrub native to India. In Ayurveda it is classified as a rasayana — a rejuvenative — and it is currently the most widely used Ayurvedic herb in the world.
Its active compounds are called withanolides, a group of naturally occurring steroidal lactones. The word "steroidal" here describes molecular structure, not anabolic activity: withanolides are not anabolic steroids and do not act like them.
Ashwagandha is best understood as an adaptogen — a substance studied for its capacity to moderate the body's stress response. Its main documented effect is on the hypothalamic-pituitary-adrenal axis, the system that governs cortisol. Because sustained high cortisol suppresses testosterone production, this gives ashwagandha an indirect route to hormonal effects, alongside any direct one.
What Is Shilajit?
Shilajit is a blackish-brown resin that seeps from rock crevices in the Himalayas and other high mountain ranges. It forms over centuries from compressed plant matter and is not a herb in the botanical sense — it is a mineral-rich organic exudate.
Its principal active constituent is fulvic acid, along with related humic substances and dibenzo-alpha-pyrones. Fulvic acid has been studied for its role in cellular energy metabolism, specifically in supporting mitochondrial function — the process by which cells generate ATP, the body's energy currency.
One point matters more than any other with shilajit: raw shilajit must never be consumed. In its unprocessed state it can carry rock, soil and mineral contaminants. Traditional Ayurvedic preparation involves a purification process called shodhana, and every trial worth citing has used purified shilajit, not raw material.
Which One Raises Testosterone? What the Trials Actually Show
Shilajit has the more convincing single trial; ashwagandha has more trials with less consistent results. Both are worth looking at in detail, because the differences in study design matter.
The shilajit evidence
The most-cited study is a randomised, double-blind, placebo-controlled trial published in Andrologia in 2016. Ninety-six healthy men aged 45 to 55 were given either 250 mg of purified shilajit twice daily or placebo for 90 days; 75 completed the study. The shilajit group showed a significant increase in total testosterone — around 20% — along with increases in free testosterone and DHEA-S. Notably, the gonadotropic hormones LH and FSH remained stable, which suggests the effect did not come at the cost of disrupting the signalling chain above the testes.
The ashwagandha evidence
Ashwagandha has been studied more often, with more mixed results. A systematic review published in Advances in Nutrition in 2021 examined four randomised, double-blind, placebo-controlled studies covering 197 men in total. Three of the four found that at least eight weeks of ashwagandha raised testosterone more than placebo. One found no effect.
The most frequently quoted individual trial (Wankhede et al., 2015) found that men taking 600 mg of ashwagandha root extract daily for eight weeks saw a mean testosterone increase of 96.2 ng/dL, against 18.0 ng/dL for placebo. An important caveat that most articles omit: every participant in that study was also following a resistance-training programme. Resistance training raises testosterone on its own. The trial shows ashwagandha added to that effect — it does not show what ashwagandha would do without training.
Which Is Better for Stress, Anxiety and Sleep?
Ashwagandha, without much argument. This is its best-supported use and the one with the most consistent human trial data behind it. Multiple randomised controlled trials have reported reductions in perceived stress scores and improvements in sleep quality over four to eight weeks, alongside measurable reductions in cortisol.
Shilajit has no comparable evidence base for stress or anxiety. Some users report a calmer, steadier kind of energy, but that is anecdotal rather than trial-supported, and it should be treated as such.
If your primary complaint is that you're wired at midnight, waking unrefreshed and running on adrenaline, ashwagandha is the more logical starting point. Our detailed review of the ashwagandha stress evidence covers this in more depth.
Which Is Better for Energy and Stamina?
Shilajit, though the evidence here is thinner than its reputation implies — and that's worth saying plainly.
A 2024 systematic review in the Journal of Population Therapeutics and Clinical Pharmacology pooled 15 clinical studies covering 1,254 participants and found supportive evidence for shilajit in chronic fatigue, high-altitude sickness, cognitive function and male fertility. The reviewers' own conclusion was that most trials were small and that larger, longer, better-controlled studies are needed before firm claims are justified.
One eight-week placebo-controlled trial in 63 recreationally active men found that 250–500 mg of purified shilajit daily reduced the decline in muscle strength under fatigue. That is a performance endpoint, not a hormonal one, and the sample was small.
The honest position: shilajit's energy evidence is promising and preliminary. It is not on the same footing as ashwagandha's stress evidence, and anyone telling you otherwise is selling something.
Can You Take Ashwagandha and Shilajit Together?
Yes — for most healthy adults, taking them together is generally considered safe, and there is a reasonable rationale for it. They act through separate mechanisms, so their effects are complementary rather than overlapping. There are no documented interactions between the two.
The case for combining them is straightforward. If low energy is coming from both directions at once — a stress load that won't switch off and a genuine dip in drive and stamina — addressing one and ignoring the other tends to produce partial results. This is also the traditional Ayurvedic approach: classical formulations rarely use a single herb in isolation, because rasayanas were designed to be layered.
A practical protocol used in Ayurvedic practice:
- Shilajit in the morning, with warm water or milk — its effect on cellular energy suits the start of the day.
- Ashwagandha in the evening, or split between morning and night — its calming action suits the wind-down.
- Both with food, which reduces the mild digestive discomfort some people get on an empty stomach.
- Give it 8–12 weeks. Neither works in days. Sleep and recovery usually shift first; anything hormonal takes longer.
Dosage, Timing and How Long Each Takes
The ranges below reflect doses used in published human trials and in traditional Ayurvedic practice. They are not a prescription — confirm what's appropriate for you with a qualified practitioner, particularly if you take any medication.
| Factor | Ashwagandha | Shilajit |
|---|---|---|
| Studied dose | Ashwagandha300–600 mg/day root extract | Shilajit250–500 mg/day purified resin |
| Timing | AshwagandhaEvening, or split AM/PM | ShilajitMorning |
| With food? | AshwagandhaYes, reduces stomach upset | ShilajitYes, dissolve in warm water or milk |
| First effects | Ashwagandha2–4 weeks (sleep, stress) | Shilajit3–6 weeks (energy) |
| Full assessment | Ashwagandha8 weeks | Shilajit8–12 weeks |
| Form matters? | AshwagandhaStandardised extract preferred over raw churna | ShilajitPurified resin only — never raw |
On form: raw powders vary substantially in active-compound content from batch to batch, which is why two people taking nominally the same thing can have very different experiences. Standardised extracts are lab-tested to deliver a consistent percentage of actives, matching the doses used in research.
Safety, Side Effects and Who Should Be Careful
Both are well tolerated by most healthy adults. Both have specific situations where caution is warranted, and these are worth knowing before you start rather than after.
Ashwagandha
The 2024 systematic-review literature and NIH's LiverTox database both describe ashwagandha as generally safe, with no serum enzyme elevations reported in clinical trials. Separately, LiverTox notes that rare cases of clinically apparent liver injury have been reported in people taking commercial ashwagandha products, typically resolving within one to four months of stopping. It assigns a likelihood score of B — a likely cause — while stating that such injury "occurs although rarely," and advises avoiding it if you have cirrhosis or advanced chronic liver disease.
In practice, for a healthy adult taking a sensible dose, this is a low-probability concern rather than a reason to avoid the herb. It is a good reason to source from a manufacturer with real quality control, since several reported cases involved products of uncertain composition.
Be cautious or check with a doctor first if you: are pregnant or breastfeeding; have a thyroid condition or take thyroid medication (ashwagandha can raise T3 and T4 and lower TSH); have an autoimmune condition; take sedatives; have existing liver disease; or have surgery scheduled within two weeks.
Shilajit
In the 2024 systematic review covering 1,254 participants, adverse events were mild and transient — mainly digestive discomfort and headache — with no serious adverse events reported.
The real shilajit issue is not the substance but the supply chain. Because it forms in rock over centuries, unpurified or poorly processed shilajit can carry heavy metals including lead, arsenic and cadmium. Independent testing gives a mixed picture: ConsumerLab's 2024 testing of eight popular shilajit products found heavy metal levels below thresholds of concern at a single daily dose, while other analyses have flagged contamination in specific unregulated products. The risk is real but not universal, and it is entirely a function of sourcing and processing.
What to actually ask a seller: is the product purified rather than raw, is it manufactured under GMP conditions, is it registered with a regulator such as AYUSH, and is batch testing carried out. A seller who cannot answer those four questions is not one to buy from.
Be cautious or check with a doctor first if you: have gout or elevated uric acid; have haemochromatosis or another iron-overload condition; are pregnant or breastfeeding; are under 18; or take medication for diabetes or blood pressure.
So Which Should You Choose?
Match the herb to the problem rather than to the marketing:
| If your main issue is… | Start with | Why |
|---|---|---|
| Stress, anxiety, poor sleep | Start withAshwagandha | WhyStrongest and most consistent human evidence |
| Low energy, poor stamina, slow recovery | Start withShilajit | WhyActs on cellular energy production |
| Testosterone support, age 40+ | Start withShilajit | WhyThe 90-day trial was run in men aged 45–55 |
| Testosterone support while training | Start withAshwagandha | WhyTrial evidence pairs it with resistance training |
| Both stress and flagging drive | Start withBoth | WhyDifferent mechanisms, no known interaction |
There's also a third option people rarely consider: rather than choosing between two single substances, traditional Ayurvedic practice combines several herbs that work on different parts of the same system. That's the reasoning behind a multi-herb formulation — Ashwagandha for the stress side, Kaunch Beej and Gokshura for hormonal signalling, Safed Musli for stamina — rather than relying on any one ingredient to do everything.
Frequently Asked Questions
Which is better, ashwagandha or shilajit?
Neither is universally better. Ashwagandha has stronger evidence for stress, anxiety and sleep. Shilajit has the more convincing single testosterone trial and is better suited to low energy and stamina. Choose based on your primary symptom, or take both, since they work through different mechanisms.
Can you take ashwagandha and shilajit together?
Yes, for most healthy adults. There are no documented interactions between them, and they act on different systems — ashwagandha on the stress axis, shilajit on cellular energy production. Take shilajit in the morning and ashwagandha in the evening, both with food. Check with a doctor if you take medication.
Does shilajit increase testosterone?
One randomised, double-blind, placebo-controlled trial found roughly a 20% increase in total testosterone after 90 days of 250 mg twice daily in healthy men aged 45–55 (Andrologia, 2016). It is a single trial in a specific age group and has not been replicated at scale, so treat it as promising rather than settled.
Does ashwagandha increase testosterone?
Evidence is positive but less consistent. A systematic review of four placebo-controlled trials in 197 men found increases in three of the four after at least eight weeks. The most-cited trial combined ashwagandha with resistance training, which independently raises testosterone — a confounder worth keeping in mind.
What is the best time to take ashwagandha and shilajit?
Shilajit in the morning, since it supports cellular energy production. Ashwagandha in the evening, or split between morning and night, since its main effect is calming. Take both with food to reduce the chance of mild digestive discomfort.
Who should avoid ashwagandha?
Avoid or seek medical advice first if you are pregnant or breastfeeding, have a thyroid condition or take thyroid medication, have an autoimmune condition, take sedatives, have existing liver disease, or have surgery scheduled within two weeks. NIH's LiverTox advises against use in cirrhosis or advanced chronic liver disease.
How long does each take to work?
Ashwagandha typically shows effects on sleep and stress within two to four weeks, with eight weeks needed for a full assessment. Shilajit usually takes three to six weeks for energy changes and eight to twelve weeks for anything hormonal. Neither works in days.
Is it safe to take shilajit every day?
Purified shilajit at 250–500 mg daily was well tolerated across 15 studies covering 1,254 participants, with only mild, transient side effects reported. Never take raw or unpurified shilajit. Source from a manufacturer that purifies, batch-tests and holds regulatory registration.
The Bottom Line
Ashwagandha and shilajit solve different problems, and the useful question is not which is stronger but which matches what you're dealing with. If stress is the thing keeping you flat, ashwagandha has the better evidence. If it's energy and drive, particularly past 40, shilajit has the better single trial. If it's both, taking them together is reasonable and traditional.
Two things matter more than which you pick: get a morning blood test if you suspect your testosterone is genuinely low, and give whatever you choose a full eight to twelve weeks before judging it. Most people who conclude "it didn't work" stopped at week three.
If you want both routes covered in one routine, the Shilajit Resin + Vitality Mix pairs purified Himalayan resin with a multi-herb Ayurvedic blend, formulated and reviewed by a practising B.A.M.S. physician. You can also browse the full men's wellness range, or message our wellness team on WhatsApp if you'd rather talk it through before buying anything.
Sources
- Pandit S. et al., Andrologia, 2016 — "Clinical evaluation of purified Shilajit on testosterone levels in healthy volunteers." Randomised, double-blind, placebo-controlled, 90 days.
- Wankhede S. et al., Journal of the International Society of Sports Nutrition, 2015 — "Examining the effect of Withania somnifera supplementation on muscle strength and recovery: a randomized controlled trial."
- Smith S.J. et al., Advances in Nutrition, 2021 — "Examining the Effects of Herbs on Testosterone Concentrations in Men: A Systematic Review."
- LiverTox, National Institute of Diabetes and Digestive and Kidney Diseases (NIH) — Ashwagandha monograph, updated December 2024.
- Journal of Population Therapeutics and Clinical Pharmacology, 2024 — "Systematic Review of Shilajit: Clinical Efficacy and Safety." 15 studies, 1,254 participants.
- Chauhan S. et al., Health Science Reports, 2022 — Ashwagandha root extract, well-being and sexual performance in adult males.
- ConsumerLab, 2024 — Independent testing of shilajit supplements for fulvic acid content and heavy metals.
- Ayamveda — Scientific Studies index
