The actual amount was was probably in the tens or so of milligrams. "A milligram" is a slightly hyperbolic way of saying "a very small amount", down in the smal

The actual amount was was probably in the tens or so of milligrams. "A milligram" is a slightly hyperbolic way of saying "a very small amount", down in the small-fractions-of-a-gram level. I forget that not everyone on the Internet is aware of English idiom.