*exclamer* Subjective information..
Boosting your testosterone naturally is not going to have nearly as much effect at gaining muscle as just getting the right amout of protein/fat/carbs, but anyways...
1. Soy products.
2. Zinc (50 mg)
3. Don't eat a few hours before you goto sleep. (growth hormone)
4. Get 'all' your vitamines & minerals.
5. Keep stress low. Very importent (Raises in coristal lower testosterone)
6. Do excercises that involve lots of muscles. Squat, deadlift, bench, bentover row etc..
7. Lift with high intensity.
8. Eat correctly. Low fat (20-30%). Enough protein/carbs.
9. Don't overtrain.
10. Get your rest.
11. Don't take steriods.
Just use common sense and don't go overboard on any of these things.