Tongkat Ali (Eurycoma longifolia) is a flowering plant native to Southeast Asia, particularly Malaysia, Indonesia, and Thailand. It's also known as Malaysian ginseng or longjack.

What it is: A tall, slender tree whose roots have been used for centuries in traditional medicine across the region.

Primary uses:

• Testosterone support — It's most well-known for potentially boosting testosterone levels, particularly in men with low T. Some studies show modest increases.
• Male fertility — May improve sperm quality and motility.
• Energy & libido — Traditionally used as an aphrodisiac and to combat fatigue.
• Stress reduction — Some research suggests it may lower cortisol levels.
• Athletic performance — Marketed to support muscle strength and body composition.