Even if you’re on a budget, it’s important to buy high quality supplements to reduce the chances of ingesting unnecessary fillers or harmful contaminants. Supplements are not one-size-fits-all – some, such as St. John’s wort, for example, can interact badly with other supplements or medications. If you take too high an amount of certain supplements, you could have adverse reactions. Supplement side effects can include headaches, fatigue, rashes, digestive trouble, organ damage and more. If you’re noticing anything concerning, contact your medical team.