Neither testosterone or deca are liver toxic or effect your liver at all.
Nothing will put on size and strength like the old school classic bulking cycle of test + deca. The problem is that both deca and test are known to cause a lot of water retention. Especially if you aren't using the proper support supplements with your cycle.
Remember to include the proper support supplements with your cycle:
1. An AI to keep estrogen in the low-normal range. Aromasin at 10mg EOD is a good dosage.
2. An anti-prolactin drug to keep prolactin in the low-normal range. Cabergoline at 0.25mg EOD is a good dosage.
The support supplements are very important because high estrogen and prolactin levels can lead to side effects like gyno and water retention.
Here's what I recommend:
Weeks 1 - 16
testosterone 500mg/week
deca 300mg/week
aromasin 12.5mg every other day
cabergoline 0.25mg every other day
After your cycle run the perfect PCT protocol:
http://www.evolutionary.org/the-perfect-post-cycle-therapy-pct/
You can order the support supplements and PCT protocol from ag-guys.com n2bm.com and sarms1.com
Nothing over the counter will be strong enough to prevent estrogen and prolactin increases from steroid usage.