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Ashwagandha, a root steeped in centuries of traditional use for enhancing stamina, strength, libido, and virility, is gaining recognition in modern times for its muscle and strength-building benefits. This blog post delves into the results of various studies, shedding light on the scientific evidence behind the claims and emphasizing the potential impact of KSM-66 ashwagandha root extract.

Clinical Trial Insights

A randomized, double-blind, placebo-controlled clinical trial involving 57 young men demonstrated significant improvements in muscle strength. Men receiving 600mg/day of KSM-66 ashwagandha root extract exhibited substantial increases in bench press 1-RM, leg extension strength, and muscle size compared to the placebo group.[5]

Bench Press and Leg Extension Results

Ashwagandha group increased bench press 1-RM by an average of 46.05kg (~101 pounds) compared to 26.42kg (~58 pounds) in the placebo group. Lower body strength improved with the ashwagandha group showing a 1-RM increase of 14.5kg (~32 pounds) compared to 9.77kg (~21 pounds) in the placebo group.[5]

Muscle Size and Fat Reduction

Significant increases in chest and arm muscle size were noted in the ashwagandha group.

Both groups experienced a reduction in body fat percentage, with the ashwagandha group showing greater results (average reduction of 3.47%).[5]

Testosterone Levels

Supplementation with KSM-66 ashwagandha resulted in a remarkable 15.3% increase in testosterone levels, compared to 2.7% in the placebo group.[5]

Additional studies support these findings, with increases ranging from 16.65% to 17% in testosterone levels.[6][7][8]

Bioactive Compounds and Mechanisms

Ashwagandha contains bioactive compounds such as steroidal lactones, saponins, and alkaloids. These compounds contribute to muscle growth by increasing testosterone levels and decreasing cortisol, along with enhancing mitochondrial energy levels and creatine production.[5]

Muscle Recovery

KSM-66 ashwagandha supplementation enhances muscle recovery, allowing for greater training intensity and volume in subsequent workouts.[5]


Ashwagandha, especially in the form of KSM-66 root extract, stands out as a powerhouse for enhancing strength, muscle growth, and testosterone levels. The scientific evidence from various studies underscores its effectiveness in promoting physical performance, making it a valuable addition to fitness regimens. As a premier ashwagandha supplement, KSM-66 offers a root-only extract supported by extensive research, making it a reliable choice for those seeking holistic health benefits. Want to learn more about Ashwagandha? Stop by your local store and ask one of our experts for more information or get yours here!


‌[5] - Clinical Trial: 8-week randomized, double-blind, placebo-controlled study

[6] - Upcoming Study: Muscle strength and recovery with KSM-66 ashwagandha

[7] - The Journal of Evidence Based Complementary & Alternative Medicine (2013)

[8] - Recent Study: 16.65% increase in testosterone levels with KSM-66 Ashwagandha root extract.