cysteine 15-20 mg/kg
methionine: ~10 mg/kg
....which is the reversal of the existing recommendations. the reasons for this are as follows:
1) vegetarians need more taurine production than meat eaters.
2) cysteine is easier to find than methionine in a meatless diet
3) excess methionine consumption leads to excess homocysteine which leads to death
so, the current recommendations - based on the idea that methionine is essential and cysteine isn't - seem to have the basic health prerogatives backwards. it's just based on a conservative accounting mechanism, which is frankly kind of stupid, in context - and something i've reacted to before. whether something is essential or not shouldn't determine whether it's given priority over things that aren't. in context, excess methionine is actually even potentially deadly, which is perhaps even why we evolved to prevent ourselves from converting cysteine back to methionine - our body is maybe dropping a bit of a hint, with that.
but i need better data on a high cysteine, low methionine diet and i can't currently find it.