Clenbuterol is a class of drugs, rather than a specific material, is able to promote lean growth and feed additives. To promote lean growth, inhibit fat growth substances can be called "lean"

Lean meat is a fine, rather than a specific kind of material, it is the ability to promote growth of lean meat feed additives. Any lean meat to be able to promote growth, suppress growth of fat meat material can be called "lean meat fine"

The thin carnosine is a kind of medicine, but is not one specific material, is refers can promote the feed additive which the lean meat grows.Any can promote the lean meat to grow the material which, the suppression fat grows all to be possible to be called “the thin carnosine”

Clenbuterol is a drug, rather than a specific substance, is a feed additive to promote muscle growth. Any substance can promote muscle growth, growth inhibition of fat can be called "lean"

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