1. Stress and mood management
Both are adaptogens: Both herbs help the body adapt and respond to physical and mental stress. Ashwagandha is particularly known for its stress-reducing and calming effects, while Maca can also help with mood and reduce anxiety.
Reduced cortisol levels: Ashwagandha has been shown to lower cortisol, the stress hormone, according to Healthline.
Enhanced mental well-being: The combination may lead to a more positive mood, reduced anxiety, and better sleep quality. 
2. Energy and physical performance
Boosted energy and stamina: Maca is well-known for its energy-enhancing properties and can improve endurance. Ashwagandha may also contribute to increased energy levels and stamina.
Improved athletic performance: Research suggests that Ashwagandha can enhance physical performance, including strength and oxygen use during exercise. Black Maca is also used by athletes to increase endurance and stamina. 
3. Hormonal balance and reproductive health
Hormonal regulation: Black Maca is particularly valued for its potential role in balancing hormones, especially those related to sexual health.
Improved libido: Both Ashwagandha and Maca have been traditionally used and researched for their potential to enhance libido and sexual function in both men and women.
Support for male fertility: Studies suggest that Black Maca may improve sperm count and motility. Ashwagandha may also increase testosterone levels and improve sperm quality. 
4. Cognitive function and mental clarity
Improved memory and focus: Both herbs may enhance cognitive function, memory, and concentration.
Reduced brain fog: Maca may be particularly helpful in clearing "brain fog" and improving mental clarity. 
5. Other potential benefits
Reduced inflammation: Black Maca and Ashwagandha contain compounds that may help reduce inflammation.
Improved sleep quality: Ashwagandha is often used to promote restful sleep and has shown promise in improving sleep quality and reducing insomnia symptoms.
Antioxidant effects: Black Maca contains high levels of antioxidants, protecting against oxidative stress.