Are you taking supplements? Are you taking prescription medications too? Sometimes the two types of medications inhibit the reactions of each other. Instead of being awesome for you, the medication ends up being bad for you.
Garlic is used to regulate diabetic blood glucose levels and decrease heart disease but if the client is taking a blood thinner, garlic may cause the medication to not absorb as much of the medication. This means that the medication may not be the right amount and cause more bleeding or thinning of the blood than intended. This can interfere with blood work done used to manage the amount of medication given to thin the blood.
Now you know why Vampires are not happy with folks who eat garlic. Your blood is like drinking a “diet” or “low platelet” drink.