In the lab you can choose to turn in 50 rubies and saphires for research, or the 10 golden nuggets, I really want to know what you get from these actions

If you experiment the one which requires 50x Ruby and 50x Sapphire, if your experiment is successful, you will get Leftovers! There is only 50% chance of success! 2nd experiment requires 10x Nuggets! And the experiment prize is Black Sludge!

Ok thanks, is there anyway to increase your chances, or is it always a 50/50 shot. And which one is more worth it because leftovers restores health to everything but thats 50 ruby and 50 saphire and doesnt black sludge only help poison type wich is only 10 nuggets

You cannot change the rates! Its always 50/50! Also, Leftovers is more useful than Black Sludge! Only few leftovers are in game!