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You think me made by man and grim,

Controlling, changed at corporate whim,

But I am natural, no bungle,

Ancient, when the world a jungle,

Now I keep a balance, all in health,

But first I keep myself.

'Are you twins?'
'By now I'd be triplets.'
'How do you start as twins and become triplets?'
'That's simple, make another of yourself that's the same but entirely independent.'

Riddle Answer Law

Riddle Explanation
but I am natural, no bungle - natural laws.

ancient, when the world a jungle - the law of the jungle.

now I keep a balance, all in health, but first I keep myself - self-preservation is the first law of nature.