Well here's a natural stack you can use that also used to muscle up livestock.
Betaine
From Muscle and Fitness
"This unique amino acid (also called trimethylglycine) derived from beets aids joint and liver repair, joint building, and liver protection. Studies show that it boosts strength and power, increases growth hormone and insulin-like growth factor-1 (IGF-1) levels, and even acts like the body's own production of creatine. Research suggests that it may also support faster recovery from injury and inflammation."
DOSAGE: l,500-3,000 mg with meals twice per day. These doses can also be taken pre and post-workout instead of with meals.
Lysine
According to Nutrabio
"Lysine is an essential amino acid, which means your body cannot manufacture it so it must be obtained through the diet or by supplementation. Lysine is an essential component of all proteins and works with other essential amino acids to maintain growth, lean body mass, and the body's store of nitrogen.
Lysine acts as a precursor for several other amino acids, including L-Citrulline (needed for normal protein metabolism) and L-carnitine (needed for fat metabolism). Lysine is crucial for the formation of collagen, a major part of the body's connective tissues and appears to help the body absorb and conserve calcium and may reduce its excretion.
Lysine contributes to energy production when converted to acetyl coenzyme A, one of the principal fuels for the Krebs cycle. Lysine is needed for growth and to help maintain nitrogen balance in the body. L-lysine has many other functions in the body because it is incorporated into many proteins, which are used by the body for a variety of purposes. Lysine supports a healthy immune system."
Dosage: 1,000-3,000 mg with meals
Sources:
Stoppani, Jim. "The Encyclopedia of Supplements A-F." Flex Dec. 2011: 196+.
Nutrabio Lysine
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Trimethylglycine stimulates muscle growth via IGF-1 20.02.2014
The anabolic effect of betaine 04.11.2013
Betaine gives bodybuilders more muscle and less fat 24.10.2013
Sprint faster with betaine 13.12.2012
Twenty grams of creatine makes you stronger; two grams of betaine doesn't 15.10.2011
Superstack: CLA + betaine 10.05.2009
Trimethylglycine helps you get more reps out of your squats 03.04.2009
Betaine supplementation (2.5g/day for roughly 2 weeks) has been shown to increase muscular force and power output in multiple human studies.
— SuppWithThat.com (@SuppWithThatcom) July 30, 2014
What You Need To Know About Betaine
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— SuppWithThat.com (@SuppWithThatcom) July 30, 2014