I was very interested in Rod Hutchinson's writings on flavours, and his Ultraspice and Megaspice regularly appeared (along with Chocolate Malt) and someone else mentioned Garlic oil as an attractor so I combined the spice flavours with a Garlic and soya bean oil used in bird feeds as it was supposedly an appetite stimulant.
It was not for allicin, but simply because they were good attractors in their own right and work well combined.
The additional benefits regarding digestion and health were a beneficial 'side effect'.