The task force also examined the side effects and costs of these therapies. It found, for example, that the omega-3 fatty acids have a low risk of side effects and are inexpensive, that SAMe has a relatively low risk of side effects and is expensive, and that St. John's wort carries a risk of interactions with drugs such as antiretrovirals, immunosuppressants, antineoplastic agents, anti-coagulants, and oral contraceptives.