MCSabstrad is a plant growth regulator produced by Agroekoprodukt, LLC (Ukraine). The preparation is denatured soybean meal treated with a 40% formaldehyde solution. It contains bioactive protein (40-49%), carbohydrates (20-30%), fats (4-5%), fiber (6-7%), and minerals (12%). The preparation is intended for use as an additive to compost for mushroom cultivation. It may help improve soil structure and provide optimal conditions for mushroom growth. MCSabstrad is used in agriculture, especially for mushroom cultivation. Its use allows improving compost quality and, consequently, enhancing conditions for mushroom growth. This makes it a valuable tool for farmers engaged in large-scale mushroom production. The manufacturer, LLC "Agroekoprodukt," guarantees high product quality and compliance with all standards established for agricultural products. MCSabstrad is a reliable and effective plant growth regulator that can be used in compost production at agricultural enterprises.