Primary functions: Accelerates strength recovery, builds training endurance, and supports muscle performance.

What this means for you: PeptiStrong™ helps you bounce back faster between sessions while also improving how much work you can do during training. It's not just about feeling less sore—it's about getting stronger and being able to push harder.

Clinical evidence in human studies:

• Faster return to full strength: After an intense resistance training session, participants taking PeptiStrong™ returned to their baseline strength within 48 hours. The placebo group? Still recovering. By 72 hours, the PeptiStrong™ group had actually exceeded their starting strength levels. [1]
• Sustained recovery advantage: When researchers tracked recovery across the full 72-hour window, they found the PeptiStrong™ group maintained a consistent advantage throughout—not just at one isolated point in time. [1]
• Significantly better endurance and work capacity: After 56 days of resistance training, the group taking PeptiStrong™ showed a 21.6% greater improvement in how many repetitions they could perform to exhaustion. [2]
• Better comeback after time off: In a study examining what happens when people stop training and then start again, participants taking PeptiStrong™ showed faster muscle protein rebuilding during the return-to-training phase. This matters when life gets in the way and you need to rebuild momentum. [6]

How it works: Research in laboratory models supports the biological mechanisms behind these results—the peptides appear to activate muscle-protective signaling pathways and counteract processes that lead to muscle breakdown. This helps explain why the human studies show such consistent benefits. [7]

Primary function: Supports the conditions your body needs for effective recovery—mainly by helping manage stress and improving sleep quality.

What this means for you: Your body can't recover properly when it's stuck in high-stress mode. Chronic stress keeps cortisol elevated and disrupts sleep, both of which interfere with muscle repair and adaptation. Shoden® helps create a physiological environment where recovery can actually happen.

Clinical evidence in human studies:

• Significant cortisol reduction: In a 60-day study with adults experiencing elevated stress, participants taking Shoden® showed a 66–67% decrease in morning cortisol levels. The placebo group showed essentially no change (~2%). Lower cortisol means your body isn't constantly in stress mode, which creates better conditions for recovery. [3]
• Meaningful stress reduction: In another placebo-controlled study, researchers documented significant improvements in how stressed adults responded to and managed stress in their daily lives. [5]

Substantial sleep quality improvement: In a sleep study, participants reported 72% improvement in sleep quality with ashwagandha supplementation. Better sleep directly translates to better recovery. [4]

Primary function: Promotes a calmer mental and physical state that supports recovery processes.

What this means for you: L-theanine is an amino acid found naturally in tea that helps take the edge off stress without making you drowsy. It supports the kind of relaxed-but-alert state that's conducive to recovery—think "calm focus" rather than "wired and tired."

A randomized controlled trial found that 4 weeks of L-theanine supplementation improved stress-related symptoms in healthy adults. While many studies use higher doses, this formulation includes a supportive amount that works synergistically with the other ingredients. [11]

Primary function: Supports normal muscle function and strength, particularly important for individuals with insufficient vitamin D levels.

What this means for you: Vitamin D acts more like a hormone than a typical vitamin—it's involved in muscle protein synthesis and muscle cell function. Many people have suboptimal levels, especially those who spend most of their time indoors or live in northern climates.

A systematic review analyzing multiple randomized controlled trials found that vitamin D supplementation improved muscle strength (measured by handgrip strength) in postmenopausal women. The benefits appear most pronounced in individuals with initially low vitamin D status. [8]

Primary function: Essential mineral for normal muscle and nerve function, plus cellular energy production.

What this means for you: Magnesium is involved in over 300 reactions in your body, including the ones that make your muscles contract and relax properly. The glycinate form used here is highly absorbable and gentle on digestion. Many active individuals have low magnesium levels due to increased losses through sweat.

A randomized trial in healthy older women found that magnesium supplementation improved physical performance measures over 12 weeks. While the study dose was higher than what's provided here, this amount contributes meaningful support as part of the overall formulation. [9]

Primary function: Supports normal glucose metabolism and insulin function, which contributes to healthy energy utilization.

What this means for you: Chromium helps insulin work more effectively at shuttling glucose into cells where it can be used for energy. While it's not a primary "performance" ingredient, adequate chromium status supports the metabolic processes that fuel training and recovery.

A systematic review of randomized controlled trials examining chromium supplementation found beneficial effects on glucose metabolism markers. Chromium is included here as foundational nutritional support rather than a headline ingredient. [10]