TNT 400 is a combination of Testosterone Enanthate and Trenbolone Enanthate. This is a popular combination of two steroids for mass building. The test may cause some bloating but not much and Trenbolone is a drug that combines the best of all steroids but is very toxic. This is a great all around combo if you want to build good solid gains without much water retention.
The downside of this drug combo is that you have a combo that has pretty much every side effect known. Also, the toxicity is quite high due to the Tren. The test with definitely aromatize, not as bad as with a cycle of straight test, but you will see some bloat. Also there is acne, male pattern baldness, prostate enlargement, aggression if you are prone to that. The trenbolone is very toxic and hard on the liver and kidneys. It’s not uncommon with tren to see blood in the urine. Probably one of the reason people combine the test with tren for a bulking cycle is to minimize the side effect from the tren and still get some of the benefits of the hard lean look you get with the tren.