Animal’s M-Stak™ has been a recognizable name in sports nutrition for years, and its 2026 reformulation brings a more science-forward approach to the brand’s non-hormonal performance support formula.
The updated Animal M-Stak™ now includes PEAK ATP®, alongside other branded ingredients such as PeakO2® and AstraGin®. The new formula is structured around multiple functional complexes designed to support training performance, nutrient utilization, and recovery-focused nutrition.
For PEAK ATP®, the inclusion marks another example of how brands are using clinically studied ingredients to build more differentiated sports nutrition products.
A Familiar Product, Rebuilt for Today’s Sports Nutrition Consumer
M-Stak has historically occupied a specific space in Animal’s lineup as a non-hormonal muscle-building product for serious lifters. The 2026 update keeps the pill pack format Animal is known for while refreshing the formula with ingredients that better align with today’s demand for research-backed performance support.
This kind of update reflects where sports nutrition continues to move. Consumers are increasingly looking for products that are not only intense, but also built with ingredients that have a clear purpose within the formula.
Why PEAK ATP® Fits the Formula
The new Animal M-Stak™ formula includes PEAK ATP®, an exogenous form of oral adenosine 5′-triphosphate disodium exclusively available through TSI Group. ATP is known as the body’s energy currency and plays a central role in muscle function.¹ PEAK ATP® is used in sports nutrition formulas as a non-stimulant performance ingredient.
As brands continue to build more complete and versatile products, PEAK ATP® offers a differentiated type of support within formulas focused on training and performance. Its inclusion in Animal M-Stak™ shows how ATP-based ingredients continue to have a place in modern sports performance products.
Research on oral ATP supplementation has explored its effects on resistance-trained adults. In a 12-week resistance training study, daily supplementation with 400 mg ATP was associated with improvements in strength, power, and muscular adaptations when combined with resistance training.²
Acute research has also evaluated ATP supplementation in exercise settings. In a randomized, placebo-controlled crossover study, ATP supplementation improved lower-body resistance training performance in resistance-trained males.³ A separate dose-response study also found that acute ATP supplementation supported lower-body resistance training performance and energy expenditure.⁴
For formulators, that matters. Consumers are increasingly looking for products that are not just built around familiar categories, but around ingredients with clear dosing rationale and performance-focused research. Brands can learn more about the supporting science on the PEAK ATP® clinical research page.
Supporting Performance Without a Hormonal Positioning
One of the reasons this launch is notable is the formula’s non-hormonal positioning. In sports nutrition, many consumers are looking for products that support hard training without moving into hormone-focused territory.
PEAK ATP® fits well within that approach. It is positioned around exercise performance, power output, blood flow, and training capacity rather than hormonal mechanisms. Research has explored ATP’s role in supporting blood flow and oxygen delivery during and after exercise, which may be relevant for performance-focused formulations.¹
In M-Stak™, PEAK ATP® sits alongside other formula components aimed at supporting different aspects of training. This reflects a broader formulation trend in the category: products are becoming more multi-dimensional, combining ingredients that support output, recovery, nutrient utilization, and training consistency from different angles.
What This Means for Sports Nutrition Innovation
The updated Animal M-Stak™ is another signal that sports nutrition is continuing to move toward more sophisticated formulas. Consumers are more educated than ever, and brands are being pushed to explain not just what is in a product, but why each ingredient is there.
For PEAK ATP®, its inclusion in a legacy product like Animal M-Stak™ reinforces its relevance in modern performance formulas. It also shows how established brands are refreshing familiar products with clinically studied ingredients that can support stronger positioning in a competitive market.
As the sports nutrition category continues to evolve, ingredients like PEAK ATP® give brands a way to build formulas that speak to performance-driven consumers and the growing demand for research-backed product innovation.
PEAK ATP® in the Next Generation of Performance Products
The 2026 Animal M-Stak™ reformulation highlights a larger shift happening across the industry. Performance products are no longer built on intensity alone. They need science, clear ingredient purpose, and a formulation story that makes sense to educated consumers.
With PPEAK ATP®, Animal’s updated M-Stak™ demonstrates how ATP supplementation can be incorporated into a modern, non-hormonal sports nutrition formula designed for serious training support.
For brands developing the next generation of performance products, PEAK ATP® offers a patented, clinically studied ingredient option designed to support exercise performance, strength, power, and blood flow when paired with regular training. To learn more about how PEAK ATP® supports performance-focused formulation, visit the PEAK ATP® About and Clinical Research pages.
For a deeper breakdown of the full Animal M-Stak reformulation, including the complete ingredient profile and product positioning, read PricePlow’s full blog post.
References
- Jäger R, et al. Health and ergogenic potential of oral adenosine-5’-triphosphate supplementation. Journal of Functional Foods. 2021. https://www.sciencedirect.com/science/article/pii/S1756464621000062
- Wilson JM, et al. Effects of oral adenosine-5’-triphosphate supplementation on athletic performance, skeletal muscle hypertrophy and recovery in resistance-trained men. Journal of the International Society of Sports Nutrition. 2013. https://pubmed.ncbi.nlm.nih.gov/24330670/
- Freitas MC, et al. Adenosine 5’-triphosphate supplementation improves lower body resistance exercise performance. Journal of the International Society of Sports Nutrition. 2017. https://pubmed.ncbi.nlm.nih.gov/29045315/
- Jäger R, et al. Dose Response of Acute ATP Supplementation on Strength Training Performance. Frontiers in Sports and Active Living. 2021. https://www.tandfonline.com/doi/full/10.1080/27697061.2023.2301400
