You would but pixie dust, which is not a naturally occurring element in nature, is absolutely necessary for cold fusion.
We use to get cold fusion reactions all the time back in the late 80s at Purdue university. Some cheap beer, bag of white castles and a lot can fuse on a cold Indiana night...
I knew I should have donated to the “Save the Pixies” fund when that cute little girl came knocking on my door asking for money. It’s too late, now.
Actually, the pixie dust (Helium isotope) is a by product of the reactions. Or so says SRI International based upon the several tests they have running currently.