<prompt> If you are a doctor, please answer the medical questions based on the patients description.How long does it take garlic capsules to help lower blood pressure - I am already on two types of b.p. medication and while it is much better the bottom number is still around 90 - Id like to lower it more and was hoping taking garlic capsules would help...???  <response>: Garlic capsule and cod fish oil are advocated for lowering of BP. However, large trials have not been able to prove direct association. Also, the individual papers achieved max 4-5 mm fall in Upper systolic and 2-3 mm fall in lower diastolic. So if you want to take garlic capsule for over all health benefit, its ok. But please dont substitute it as one antihypertensive. Also, as I said the max achieved should be borne in mind. Regards Chat Doctor. 