6 milliliters is equivalent to about 0.202884136 ounces, or about 1/5 of an ounce. This is a very small amount, and is not even close to the amount that most people would consider a serving size. For reference, one tablespoon is equal to about 14.7867648 milliliters, so 6 milliliters is less than half a tablespoon. In terms of volume, 6 milliliters would be considered a drop in the bucket.