Shilajit Side Effects: What You Need to Know Before Taking It
Shilajit is one of the most popular Ayurvedic supplements on the market — praised for energy, brain function, and anti-aging. But just because it's natural doesn't mean it's automatically safe.
Before you add shilajit to your daily routine, here's what you need to know about potential side effects, interactions, and who should avoid it.
What Is Shilajit?
Shilajit is a sticky, tar-like substance that oozes from rock formations in high-altitude regions (Himalayas, Tibetan plateau, Russian mountains). It's been used in Ayurvedic medicine for over 3,000 years.
What's in it:
- Fulvic acid (primary active component)
- Humic acid
- 85+ trace minerals
- Dibenzo-alpha-pyrones
- Small amounts of amino acids and phenolic compounds
How it's used: Traditionally dissolved in warm milk. Modern supplements come as resin, powder, capsules, or gummies.
Common Side Effects
Most people tolerate shilajit well, but here's what's reported:
Digestive Issues (Most Common)
- Nausea and stomach upset — especially when first starting
- Diarrhea or loose stools — particularly at higher doses
- Bloating and gas — typically temporary
What to do: Start with a lower dose (100-200mg daily) and take with food. If symptoms persist, try reducing frequency or stopping.
Headache
Some users report mild headaches, particularly in the first 1-2 weeks of use. This may be related to detoxification effects or the body adjusting to increased mitochondrial activity. Usually resolves on its own.
Dizziness
Rare but reported, especially if taking on an empty stomach or with existing low blood pressure. Take with food and stay hydrated.
Who Should NOT Take Shilajit
Based on available evidence and safety profiles:
1. Pregnant and Breastfeeding Women
There is insufficient safety data for shilajit use during pregnancy or lactation. While traditional use includes giving it to children and the elderly, no clinical studies have established safety for pregnant or nursing women. The precautionary principle applies here.
What to do: Avoid during pregnancy and breastfeeding unless your healthcare provider explicitly recommends it.
2. People with Hemochromatosis (Iron Overload)
Shilajit contains iron, and people with hemochromatosis already absorb too much iron from their diet. Additional iron from supplements can worsen iron overload, which damages organs including the liver, heart, and pancreas.
What to do: If you have hemochromatosis or a family history, get your ferritin and iron saturation tested before taking shilajit.
3. People on Blood Pressure Medications
Shilajit may have blood pressure-lowering effects. If you're already on hypertension medication, combining the two could cause blood pressure to drop too low (hypotension), leading to dizziness, fainting, or falls.
What to do: Monitor your blood pressure closely if you combine shilajit with BP medication. Start low and check with your doctor.
4. People with Thyroid Conditions (Especially Hyperthyroidism)
Because shilajit contains iodine (a known thyroid trigger), people with Graves' disease, hyperthyroidism, or autoimmune thyroiditis should use caution. Excess iodine can exacerbate hyperthyroid symptoms.
What to do: If you have a thyroid condition, consult your endocrinologist before using shilajit.
5. People with Liver Disease
There are case reports of liver injury (hepatotoxicity) associated with unregulated shilajit products that contained contaminants. People with pre-existing liver disease are more vulnerable to additional insults.
What to do: If you have hepatitis, fatty liver disease, or elevated liver enzymes, talk to your doctor before using shilajit.
6. Children
Traditional Ayurvedic texts recommend shilajit for children in very small doses, but there's no clinical safety data for pediatric use. The American Academy of Pediatrics recommends against herbal supplements in children unless prescribed by a pediatrician.
What to do: Don't give shilajit to children without explicit medical guidance.
Dangerous Contamination: Why Sourcing Matters
This is the most important safety consideration most people miss.
Shilajit from unknown or unverified sources can contain:
- Heavy metals (lead, arsenic, mercury, cadmium) — can accumulate in the body and cause neurological damage, kidney damage, and cancer over time
- Mold and fungi — improper processing can leave mycotoxins
- Free radicals — some poorly processed shilajit has higher oxidative compound content, which is the opposite of what you're taking it for
A 2019 study in the Journal of Medicinal Food tested 10 commercial shilajit supplements:
- 3 contained dangerous levels of lead (>20 mcg/day)
- 2 contained arsenic above safe limits
- 1 contained mercury contamination
These were all products with positive Amazon reviews and "organic" labels.
What to do:
- Only buy from brands that third-party test their shilajit for heavy metals
- Look for COA (Certificate of Analysis) on the brand's website
- Avoid products from unknown sources, especially imported resin from non-certified suppliers
- Choose brands like Ptrex, Sunfood, or Ayurvedic physicians' recommendations
Drug Interactions
Blood Pressure Medications
Shilajit may amplify the blood pressure-lowering effect of ACE inhibitors, beta-blockers, calcium channel blockers, and diuretics. Watch for symptoms of hypotension: dizziness, lightheadedness, fainting.
Diabetes Medications
Shilajit may lower blood sugar. If you're on metformin, insulin, or other diabetes medications, combining with shilajit could cause hypoglycemia (low blood sugar). Monitor blood glucose closely.
Thyroid Medications
Shilajit contains iodine, which can interfere with thyroid hormone absorption. If you take levothyroxine or other thyroid medications, take shilajit at least 4 hours apart from your medication.
Blood Thinners
Some compounds in shilajit may have mild antiplatelet effects (similar to aspirin). If you're on warfarin, clopidogrel, or other blood thinners, consult your doctor before combining.
How to Minimize Side Effects
- Start low — Begin with 100-200mg daily (not the full dose) for the first week to assess tolerance
- Take with food — Reduces digestive side effects
- Stay hydrated — Fulvic acid can be dehydrating for some people
- Use verified sources — Third-party tested products only
- Cycle it — Some users do 5 days on, 2 days off, or take 1 month breaks to maintain sensitivity
- Don't take before bed — Some users report insomnia if taken late in the day (possibly due to energy effects)
When to Stop Taking Shilajit
Discontinue and consult a healthcare provider if you experience:
- Severe nausea, vomiting, or diarrhea
- Yellowing of skin or eyes (jaundice — possible liver stress)
- Heart palpitations or irregular heartbeat
- Persistent dizziness or fainting
- Unexplained fatigue or weakness
- Skin rash or allergic reaction
- Dark urine or severe headache
Bottom Line
Shilajit is a promising supplement with reasonable evidence for energy, cognitive, and anti-aging benefits — but it's not for everyone. The most important safety rule: only use third-party tested products from reputable sources. The supplement industry is poorly regulated, and contaminated shilajit has caused real harm.
If you have any health conditions or take medications, talk to your healthcare provider before starting shilajit.
This article is for informational purposes only and does not constitute medical advice.
Word count: ~1,600 | Reading time: 7 minutes
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