Skyeblue - you are really much better off with taking the garlic and horseraddish fresh, in your everyday diet. Tablets can take a lot for your body to break down, and often the doses in these tablets are so high (as with "one a day" vitamins) that you body cannot fully absorb all of the goodness all at once, so a lot can be lost through your urine.
You are better off taking smaller amounts many times trhough out the day...add honey to your tea or coffee, have lots of garlic for dinner, etc.
It is natural, not going to harm your bubba at all and you can control your intake to suit