Activate the Signal. Support Muscle Growth, Strength & Recovery.

MuscleSignal combines 3g of fermented L-Leucine with plant-based peptides and a complete amino acid profile to provide both the nutritional signal and building blocks involved in muscle protein synthesis.

Results can vary based on your nutrition, activity level, age, and individual needs. Some people may notice changes in recovery, energy, or workout performance within the first few weeks, while improvements in strength and muscle development typically require consistent use over time (3 to 4 months). For best results, use MuscleSignal™ daily alongside adequate nutrition and resistance exercise.

MuscleSignal is designed around muscle signaling as well as amino acid nutrition. It combines fermented L-Leucine with plant-derived peptides and a complete amino acid profile rather than focusing solely on delivering a large amount of protein.

Yes. The formula uses plant peptides derived from pea protein and fava bean protein, along with fermented L-Leucine.

Directions for use (capsules): Take 9 capsules, 1-3 times per day.

Directions for use (powders): Mix 1 serving with 8-10 oz of water, 1-3 times per day.

The supplied materials specifically identify intermittent fasting as one of the use cases for MuscleSignal. However, customers should follow their healthcare provider's guidance regarding their individual nutrition and supplement routine.

No. The supplied materials position MuscleSignal for athletes, fitness enthusiasts, busy professionals, healthy aging adults, people returning to activity, and anyone looking to maintain muscle health.

MuscleSignal™ is plant-based and does not contain any dairy or animal-derived ingredients.

mTOR stands for mechanistic Target of Rapamycin. mTOR is a cellular signaling pathway that acts as a master switch for muscle growth and repair, metabolism, and energy production.

Yes. There are three planned 30-day servings variants:

270 Capsules
- Now available

Chocolate Powder - Coming soon


Raspberry Limeade Powder - Coming soon

It's our secret weapon for a delicious shake! Premium plant peptides can naturally have a bitter, earthy profile. We use a tiny, precise amount of pure citric acid to act as a natural flavor shield. It balances the formula's pH and temporarily blocks the taste receptors that sense plant bitterness, giving you a clean, crisp, and refreshing drink.

What is the source of citric acid?

SunNutrition uses a small, precise amount of citric acid derived from cassava in MuscleSignal powders for a very specific functional reason: it naturally neutralizes the inherent earthy bitterness of premium plant-based peptides. By subtly adjusting the formula's acidity, it naturally masks bitter notes and delivers a crisp, refreshing taste profile without relying on artificial maskers or heavy chemical additives. Our citric acid undergoes a meticulous purification and crystallization process, ensuring a 100% pure ingredient that is universally recognized as safe, completely clean, and highly effective.

The level of citric acid in MuscleSignal is incredibly low, just enough to balance the natural taste parameters of our plant proteins. It has a much milder pH than a glass of orange juice or a cup of coffee,
making it highly gentle on both your stomach and your tooth enamel.

Beyond flavor modulation, citric acid is a natural chelator. It enhances the solubility of the product and assists your body in efficiently absorbing vital trace minerals like iron and zinc, which are naturally abundant in our premium plant-phase peptides.