Can You Take Shilajit and Ashwagandha Together? Dose, Timing, and Who Should Skip It

Can you take shilajit and ashwagandha together? For most healthy adults, yes. There is no documented interaction between them, they are studied for different things, and combination products have been sold in the United States for years without a pattern of problems specific to the pair.

That is the short answer, and it is the one every stacking article gives. What those articles tend to leave out is more useful: no clinical trial has ever tested shilajit and ashwagandha together, most combination products quietly underdose one of the two, and ashwagandha carries a liver-safety note from the National Institutes of Health that deserves a paragraph, not a footnote. We sell a gummy that contains both, so we have a reason to get this right rather than a reason to oversell it.

Can you take shilajit and ashwagandha together?

Yes. Purified shilajit and ashwagandha root extract have no known interaction with each other, and taking both daily is common. The cautions that apply are the ones that apply to each ingredient on its own, covered below.

What you cannot do is point to a study of the combination. Every claim about the pair, including ours, is assembled from separate trials of each ingredient. That is fine as far as it goes. It is not evidence that they do anything special together.

What each one has actually been shown to do

The research base for the two is not the same size. Ashwagandha has dozens of randomized trials and several meta-analyses behind it. Shilajit has a handful of small human studies. The table below lists the trials we consider the strongest for each, at the doses they used.

Ingredient	Trial	Dose and duration	Who	What it found
Shilajit	Keller et al., 2019, J Int Soc Sports Nutr	500 mg/day, 8 weeks	63 active men	Better retention of maximal strength after a fatiguing protocol vs placebo
Shilajit	Biswas et al., 2010, Andrologia	100 mg twice daily, 90 days	28 men who completed (of 35 enrolled), all with low sperm counts	Higher sperm count and motility, higher total testosterone
Ashwagandha	Chandrasekhar et al., 2012, Indian J Psychol Med	300 mg twice daily, 60 days	64 adults with chronic stress	Serum cortisol significantly lower than placebo (about 28% down in the published data); lower stress scores
Ashwagandha	Lopresti et al., 2019, Medicine	240 mg/day, 60 days	60 adults with stress	Lower morning cortisol and anxiety scores vs placebo
Ashwagandha	Wankhede et al., 2015, J Int Soc Sports Nutr	300 mg twice daily, 8 weeks	57 young men on a training program	Larger strength gains on bench press and leg extension than placebo
Ashwagandha	Lopresti et al., 2019, Am J Mens Health	21 mg withanolide glycosides/day, 8 weeks per arm	57 overweight men, 40 to 70	Testosterone up about 15% relative to placebo; no difference in fatigue or vigor scores

Two things stand out. First, the shilajit trials are small, and the fertility study enrolled 35 men and lost a fifth of them before the end. We have written about the limits of the shilajit evidence in detail in Do Shilajit Gummies Work?. Second, the ashwagandha doses that produced results were 240 to 600 mg of a standardized extract per day. Hold that number, because it matters in the next section but one.

Is there synergy? No one has shown any

The phrase you will meet on almost every combination product is that shilajit and ashwagandha "work synergistically" or "amplify each other." We looked for a trial that tested this and could not find one. Not a small one, not an old one, not one in animals that would justify the language.

The honest framing is narrower: the two are studied for different outcomes, so a person who wants both outcomes can take both. Shilajit's evidence is about physical performance and, weakly, male reproductive markers. Ashwagandha's evidence is about the stress response, with secondary findings on strength and hormones. They do not overlap much, which is a reason to combine them. It is not the same as one making the other work better.

When to take them: together or split?

The standard advice is shilajit in the morning and ashwagandha in the evening, because shilajit is framed around energy and ashwagandha around calm. We took that objection seriously enough to write a whole section on it, since our own gummy puts both in one morning serving. The short version:

• The morning/evening split is inferred from what each ingredient is studied for, not from any trial comparing dosing times. The ashwagandha trials above used morning dosing, split dosing, and evening dosing, and all reported effects.
• Ashwagandha is not a sedative. Drowsiness is a reported side effect in some people, but the stress trials dosed adults in the morning without knocking them out.
• If your only goal is sleep, a dedicated evening ashwagandha at a full studied dose is the better tool, and a combination product is the wrong purchase.

Taking them at the same time is fine. Splitting them is fine. Consistency matters more than the clock, because every trial in the table ran for eight weeks or longer.

How much of each, and the dose problem with combination products

Here is the part we would want a seller to tell us. A combination product has a fixed amount of each ingredient, and that amount is often well below what the studies used for at least one of them.

The studied ranges are roughly 300 to 500 mg per day of purified shilajit and 240 to 600 mg per day of a standardized ashwagandha extract. Now read the label of any two-in-one product. Many list shilajit at 100 to 300 mg. Many list ashwagandha as part of a proprietary blend with no amount at all. Some list large-looking numbers that are extract-ratio equivalents rather than what is in the capsule, a convention we explain in Shilajit 500mg vs 4,000mg.

Our own label, stated plainly: each two-gummy serving has 500 mg of purified shilajit standardized to 20% fulvic acid, which is the dose from the Keller trial, and 200 mg of ashwagandha root extract stated as a 10:1 equivalent, which means 20 mg of concentrated extract in the gummy. That ashwagandha figure is below the doses in the trials above. We think 500 mg of shilajit at a disclosed fulvic acid content is the reason to buy the product, and the ashwagandha is a secondary ingredient at a secondary dose. If you want ashwagandha at a trial-level dose, take a dedicated ashwagandha product alongside it. We would rather tell you that than imply one gummy covers both at full strength.

Who should not take them together

This is where the combination deserves more care than the stacking articles give it. Nearly every caution belongs to one ingredient or the other, so taking both means inheriting both lists.

Ashwagandha. The National Center for Complementary and Integrative Health says ashwagandha should be avoided during pregnancy and not used while breastfeeding, and is not recommended for people about to have surgery or for those with autoimmune or thyroid disorders. It lists possible interactions with medications for diabetes and high blood pressure, immunosuppressants, sedatives, anti-seizure drugs, and thyroid hormone. Because it may raise testosterone, NCCIH also advises people with hormone-sensitive prostate cancer to avoid it. And since 2017, an increasing number of clinically apparent liver injury cases have been reported in people taking products labeled as containing ashwagandha, according to the NIH LiverTox database. Those cases typically appeared two to twelve weeks after starting, and most resolved fully after stopping, but rare severe outcomes occurred in people with preexisting liver disease. Ashwagandha is still considered generally safe, and clinical trials have not reported liver enzyme problems. The practical translation: if you have any liver condition, drink heavily, or take medications that stress the liver, talk to a doctor before adding ashwagandha, and stop and get checked if you notice yellowing skin or eyes, dark urine, or itching.

Shilajit. The main risk is not the substance but its purity. Raw or poorly purified shilajit can carry lead, arsenic, and other heavy metals, which is why purification matters more than potency. We cover what to ask a seller in How to Tell If Shilajit Is Real or Fake. Shilajit is also mineral-dense and is often flagged as a caution for people with iron overload conditions such as hemochromatosis; the evidence there is thin, but the caution costs nothing.

Both. Anyone pregnant or breastfeeding, anyone under 18, anyone with an autoimmune or thyroid condition, and anyone on prescription medication should clear both ingredients with a healthcare provider first. If you have surgery scheduled, stop ashwagandha beforehand and tell your surgeon what you take.

What to expect, and how long it takes

Set expectations from the trials, not the testimonials. Every study in the table ran eight weeks to ninety days. The stress trials measured cortisol and questionnaire scores at 60 days. The strength trials measured at eight weeks. There is no study showing anything meaningful at day three.

Reasonable expectations, hedged honestly:

• Weeks one to two: probably nothing you can attribute to the supplement. Any change this early is more likely routine, sleep, or expectation.
• Weeks four to eight: this is when the ashwagandha trials found measurable stress-score changes and the shilajit trial found strength retention. If you are going to notice anything, it is here.
• Beyond eight weeks: unknown. No trial of either ingredient extends much past ninety days, so long-term effects, good or bad, are not established.

Combination product or two separate bottles?

	Two-in-one product	Separate products
Convenience	One thing to take daily	Two, with two schedules if you split them
Dose control	Fixed; usually one ingredient is underdosed	You choose trial-level doses for each
Timing flexibility	None	Full
Cost	Usually less than two bottles	Usually more
Label transparency	Varies widely; proprietary blends common	Single-ingredient labels are easier to check
Best for	People who will not stick to two bottles	People with a specific goal for each ingredient

The strongest argument for a combination product is the one nobody advertises: the supplement you actually take every morning beats the perfect protocol you abandon in week three. The strongest argument against it is dose. Decide which of those describes you.

Frequently asked questions

Can I take shilajit and ashwagandha together at night?

You can. Nothing in the trials suggests shilajit disrupts sleep, and ashwagandha is often taken in the evening. If you find shilajit makes you feel more alert, move the pair to the morning. There is no research showing one time of day works better than another for either ingredient.

Can I take shilajit and ashwagandha together every day?

Daily use is how every trial in the table dosed them, for eight to ninety days. Beyond three months, there is no published data either way. Some people take periodic breaks; there is no evidence for or against that practice.

Is shilajit and ashwagandha together good for women?

The shilajit evidence is almost entirely in men. The ashwagandha stress trials enrolled both men and women and found effects in both. No trial has tested the combination in women specifically. Ashwagandha may be unsafe in pregnancy, and women who are pregnant, trying to conceive, or breastfeeding should not take either without medical advice.

Do shilajit and ashwagandha together increase testosterone?

Each has a small trial reporting higher testosterone in men: shilajit in men with low sperm counts, ashwagandha in overweight men aged 40 to 70. Both changes stayed within the normal range. No study has tested the combination, and no study has shown an effect in men with normal starting levels. Treat "doubles your testosterone" claims as marketing.

Does shilajit and ashwagandha together help with weight loss?

There is no clinical evidence that either ingredient, alone or combined, causes weight loss. Ashwagandha has one small trial reporting reduced stress-related food cravings, which is not the same thing.

What are the side effects of taking shilajit and ashwagandha together?

Reported side effects are those of each ingredient: for ashwagandha, drowsiness, stomach upset, diarrhea, and the rare liver injury cases noted above; for shilajit, mainly the contamination risk of unpurified product. There is no side effect specific to the combination on record. For shilajit on its own, we list every reported effect and who should avoid it in our shilajit gummies side effects guide.

Can I add tongkat ali to shilajit and ashwagandha?

You will see all three stacked together in products aimed at men. Tongkat ali has its own small trial base and its own cautions. Adding a third ingredient adds a third set of unknowns and, in combination products, usually shrinks the dose of each. We do not sell it and have no evidence-based view on the triple stack beyond that.

Sources

• Keller JL, et al. The effects of shilajit supplementation on fatigue-induced decreases in muscular strength and serum hydroxyproline levels. J Int Soc Sports Nutr. 2019. PubMed 30728074
• Biswas TK, et al. Clinical evaluation of spermatogenic activity of processed shilajit in oligospermia. Andrologia. 2010. PubMed 20078516
• Chandrasekhar K, et al. A prospective, randomized double-blind, placebo-controlled study of safety and efficacy of a high-concentration full-spectrum extract of ashwagandha root in reducing stress and anxiety in adults. Indian J Psychol Med. 2012. PubMed 23439798
• Lopresti AL, et al. An investigation into the stress-relieving and pharmacological actions of an ashwagandha extract. Medicine. 2019. PubMed 31517876
• Wankhede S, et al. Examining the effect of Withania somnifera supplementation on muscle strength and recovery. J Int Soc Sports Nutr. 2015. PubMed 26609282
• Lopresti AL, et al. A randomized, double-blind, placebo-controlled, crossover study examining the hormonal and vitality effects of ashwagandha in aging, overweight males. Am J Mens Health. 2019. PubMed 30854916
• National Center for Complementary and Integrative Health. Ashwagandha: Usefulness and Safety.
• National Institute of Diabetes and Digestive and Kidney Diseases. Ashwagandha. In: LiverTox: Clinical and Research Information on Drug-Induced Liver Injury.