Shilajit and Muscle Strength: What Does Scientific Research Say?

Shilajit has traditionally been used in Ayurveda as a mineral-rich natural substance associated with vitality, strength and overall wellness. In recent years, researchers have started investigating its potential effects on physical performance, muscular strength and recovery from fatigue.

One notable human clinical study examined whether Shilajit supplementation could help reduce fatigue-related declines in muscular strength and influence serum hydroxyproline, a biomarker associated with collagen and connective tissue.

The study was conducted by researchers from the University of Nebraska–Lincoln, USA, and provides useful human clinical evidence on the potential relationship between Shilajit supplementation, muscular performance and connective tissue adaptations.

What Did the Study Investigate?

The study, titled “The effects of Shilajit supplementation on fatigue-induced decreases in muscular strength and serum hydroxyproline levels,” investigated the effects of Shilajit supplementation over an eight-week period.

Researchers evaluated two daily doses:

• 250 mg per day
• 500 mg per day

These were compared with a placebo group.

The study included 63 recreationally active men, with 21 participants assigned to each group.

Researchers evaluated several measures of physical performance, including:

• Maximal voluntary isometric contraction (MVIC) strength
• Concentric peak torque
• Fatigue-induced decline in muscular strength
• Serum hydroxyproline (HYP)

What Is Hydroxyproline?

Hydroxyproline is an amino acid that is an important component of collagen, a structural protein found throughout connective tissues such as tendons, ligaments, skin and other tissues.

Because of its relationship with collagen, hydroxyproline is often used as a biochemical marker when researchers are studying collagen metabolism and connective tissue.

This makes the measurement particularly interesting when investigating the potential effects of Shilajit on muscle and connective tissue adaptation.

What Did the Researchers Find?

After eight weeks of supplementation, the researchers observed a notable difference in the participants receiving 500 mg of Shilajit per day.

Among participants in the upper 50th percentile for baseline muscular strength, the adjusted mean decline in MVIC strength following the fatigue protocol was:

• 500 mg/day Shilajit: 8.9%
• 250 mg/day Shilajit: 17.0%
• Placebo: 16.0%

The decline in strength was significantly lower in the 500 mg/day group compared with both the 250 mg/day group and the placebo group.

This suggests that, under the specific conditions of this study, the higher Shilajit dose was associated with better retention of maximal muscular strength following a fatiguing exercise protocol.

What Happened to Hydroxyproline?

The researchers also observed differences in baseline serum hydroxyproline among participants in the upper 50th percentile group.

After supplementation, the adjusted mean baseline hydroxyproline levels were approximately:

• 500 mg/day Shilajit: 1.5 μg/mL
• 250 mg/day Shilajit: 2.4 μg/mL
• Placebo: 2.4 μg/mL

The 500 mg/day group had significantly lower hydroxyproline levels compared with both the lower-dose and placebo groups.

The researchers interpreted these findings as evidence of favorable adaptations related to muscle and connective tissue.

Does Shilajit Improve Muscle Strength?

The study provides interesting evidence that 500 mg per day of a specific Shilajit preparation may help retain maximal muscular strength following a fatiguing exercise protocol.

However, this does not mean that Shilajit automatically increases muscle strength in everyone.

The study specifically measured the ability to retain strength after a fatigue-inducing exercise protocol. It did not establish Shilajit as a replacement for resistance training, adequate nutrition, sleep or other important factors involved in physical performance.

The findings should therefore be understood in the context of the study design.

What About Shilajit and Exercise Recovery?

Fatigue and reduced muscular performance are common concerns among people who participate in regular physical activity.

The study’s findings suggest that a specific purified Shilajit preparation may have potential relevance to maintaining muscular performance following fatigue.

However, additional clinical research is needed to determine whether these findings translate into meaningful improvements in exercise recovery, athletic performance or long-term strength development across different populations.

Why Does the Dose Matter?

One interesting finding from this research was the difference between the two Shilajit doses.

The 500 mg/day group showed a significant effect on fatigue-induced strength decline, while the 250 mg/day group did not show the same statistically significant difference compared with placebo.

This highlights an important point: results from a particular dosage should not automatically be applied to other Shilajit products or dosages.

Different Shilajit products may also vary in their composition, purification and standardization.

HARSIVA and an Evidence-Informed Approach

At HARSIVA, we believe that Shilajit should be discussed through a combination of traditional knowledge, product quality and modern scientific research.

Human clinical studies such as this provide valuable information about how specific Shilajit preparations have been investigated under controlled conditions.

At the same time, scientific responsibility requires us to distinguish between research findings and product-specific clinical evidence.

This study evaluated PrimaVie® Shilajit, a specific standardized Shilajit preparation. Therefore, the results should not be presented as clinical proof that every commercially available Shilajit product will produce the same effects.

For consumers, factors such as purification, standardization, laboratory testing, quality control and ingredient transparency are important when evaluating a Shilajit product.

What Does the Research Really Tell Us?

Overall, this eight-week randomized human study suggests that 500 mg/day of a specific Shilajit preparation was associated with better retention of maximal muscular strength following a fatiguing exercise protocol and with changes in serum hydroxyproline among certain participants.

The findings are scientifically interesting because the research was conducted in humans under controlled conditions.

However, the study does not prove that Shilajit is a treatment for muscle fatigue or that it will increase strength in every individual.

More research is needed to understand the potential mechanisms involved and to determine whether similar results occur in women, older adults, trained athletes and other populations.

Conclusion

Research into Shilajit and muscle strength is still developing, but human clinical evidence provides an interesting foundation for further investigation.

In an eight-week study involving 63 recreationally active men, supplementation with 500 mg/day of PrimaVie® Shilajit was associated with a significantly smaller decline in maximal voluntary isometric contraction strength following a fatiguing exercise protocol compared with both 250 mg/day and placebo in the higher-baseline-strength group.

The study also reported lower baseline serum hydroxyproline in the 500 mg/day group, which the researchers interpreted as evidence of favorable muscle and connective tissue adaptations.

These results are promising, but they should be interpreted within the specific context of the study. They do not establish that every Shilajit product or dosage will produce the same outcome.

For HARSIVA, the most responsible approach is to recognize the traditional heritage of Shilajit while continuing to follow emerging scientific evidence and maintaining a strong focus on quality, transparency and responsible communication.

Scientific Reference

Keller JL, Housh TJ, Hill EC, Smith CM, Schmidt RJ, Johnson GO.

“The effects of Shilajit supplementation on fatigue-induced decreases in muscular strength and serum hydroxyproline levels.”

Journal of the International Society of Sports Nutrition. 2019;16:26.

PMID: 30728074
PMCID: PMC6364418
DOI: 10.1186/s12970-019-0270-2

PubMed: https://pubmed.ncbi.nlm.nih.gov/30728074/

Frequently Asked Questions

Can Shilajit support muscle strength?

A human clinical study found that 500 mg/day of a specific Shilajit preparation was associated with better retention of maximal muscular strength following a fatiguing exercise protocol. More research is needed to determine how broadly these findings apply.

Does Shilajit reduce muscle fatigue?

The study investigated fatigue-induced reductions in muscular strength rather than fatigue itself as a medical condition. The 500 mg/day group experienced a smaller decline in strength following the fatigue protocol compared with the lower-dose and placebo groups.

What dose of Shilajit was studied for muscle strength?

The study evaluated 250 mg/day and 500 mg/day for eight weeks. The significant finding related to strength retention was observed with the 500 mg/day dose in the specified subgroup.

What is hydroxyproline?

Hydroxyproline is an amino acid that forms an important part of collagen. Researchers can measure serum hydroxyproline as one biochemical marker when studying collagen and connective tissue metabolism.

Was the study conducted in humans?

Yes. The study included 63 recreationally active men and was conducted by researchers at the University of Nebraska–Lincoln in the United States.

Does this study prove that HARSIVA Shilajit improves muscle strength?

No. The study evaluated a specific standardized Shilajit preparation called PrimaVie®. Its results should not be presented as a clinical trial of HARSIVA products.

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Disclaimer: This article is intended for educational and informational purposes only. It is not intended to diagnose, treat, cure or prevent any disease or medical condition. The findings discussed are based on a specific research study involving a specific Shilajit preparation and should not be interpreted as proof of the same effects from every commercially available Shilajit product.