Some herbal remedies can weaken the effectiveness of HIV medication.
St John's wort ("Johanniskraut"), garlic preparations and ginseng cause certain HIV drugs to be broken down faster by the liver. The HIV drugs are then less effective.
And there are many other herbal or natural remedies that can be damaging for people with HIV or who are taking HIV therapy.
The German AIDS service organization offers extensive information at www.hiv-wechselwirkungen.de.