To provide for his disabled brother, a debt-coated dealer accepts a highly secretive job for a world famous chef, as purveyor of an illegal, secret ingredient.

The cannibalism part is the hook, in my opinion, so it shouldn't be ignored in the logline. With a bit of workdsmithing, here's my 2 cents:

To care for his crippled brother, a debt-ridden crook is forced to smuggle a special ingredient for a world famous chef, unwittingly delivering a more grisly package than he bargained for.

It's all in the execution, of course, but it begs the question why the world famous chef needs this particular drug smuggler's body for his special stew.

When his disabled brother becomes seriously ill, a cash-strapped drug dealer must outwit a hot shot cop to procure a rare ingredient for a famous chef to pay for the treatment.

When his disabled brother becomes seriously ill, a cash-strapped drug dealer must procure an illegal ingredient for a famous chef to pay for the treatment.

A couple of suggestions for shortened loglines based on your description.

Your additional comments were very helpful. I enjoyed reading more about your screenplay.

I think what you have written needs to be boiled into the opening line and the following needs to state what he will gain back from doing it whilst giving something that is stopping him.

'A debt-ridden drug dealer accepts work of escorting illegal ingredients within food across the Country. With a cop hot on his tail he must provide his supply to a notorious drug lord or leave his disabled brother to fend for himself.'

I know this isn't your full story but don't know if this gives you any thought. It just tells us what he is going to be doing rather than just a scene of the movie.