1. Fatty fish: Fatty fish like salmon, tuna, and mackerel are rich in omega-3 fatty acids, which have been shown to boost testosterone levels. Additionally, they are also good sources of vitamin D, which is essential for testosterone production.

2. Dark, leafy greens: These are rich in magnesium, which is essential for testosterone production and metabolism. Spinach, kale, and Swiss chard are good examples of dark, leafy greens.

3. Shellfish: Shellfish, especially oysters, are excellent sources of zinc, a mineral that is crucial for testosterone production. Other good sources of zinc include crab, lobster, and shrimp.

4. Eggs: Eggs are a good source of vitamin D and healthy fats, both of which are important for testosterone production. They are also a good source of protein, which is essential for building and maintaining muscle mass.

5. Cruciferous vegetables: Broccoli, cauliflower, cabbage, and Brussels sprouts are all members of the cruciferous vegetable family. These vegetables contain compounds that may help to reduce the conversion of testosterone to estradiol, a form of estrogen.

6. Berries: Berries are rich in antioxidants, which may help to protect the testicles from damage and improve testosterone production. Blueberries, strawberries, raspberries, and blackberries are all good examples of berries.

It's important to note that while these foods may help to increase testosterone levels, they are not a magic bullet. A healthy diet and lifestyle are essential for maintaining optimal testosterone levels. This includes getting regular exercise, managing stress, and getting enough sleep.