danger in garlic

hi, in Japan they have a mass of brilliant home-made pickles
using up to twenty different types of vinegar. one very
common thing is garlic cloves in a sweet vinegar. they are
very mild tasting and so good, it's easy to eat a whole lot
at once. however I was warned on several occasions 'not' to
eat more than two or three ( individual segments ) a day, as
to eat more was not good for you.

is there likely to be any truth in that, please?

yours john west