There are several supplements that may aid in muscle growth besides steroids. One of the most popular is whey protein powder, which is a high-quality source of protein that can help support muscle building and recovery. Creatine is another supplement that has been shown to improve muscle strength, power, and endurance, and it may also help increase muscle mass over time. Beta-alanine is another supplement that can help delay fatigue during intense training, allowing you to exercise for longer periods and build more muscle. Additionally, HMB (beta-hydroxy-beta-methylbutyrate) is a supplement that may help reduce muscle breakdown and improve muscle growth when combined with resistance training. It's important to note that while these supplements may be beneficial for muscle growth, they should be used in conjunction with a healthy diet and regular exercise.