Surely virtually everything we ingest or take medicinally has potential side effects. Just consider those who cannot drink milk (lactose intolerance) or allergies. And who doesn’t know someone allergic to nuts of some kind.
Still, truth be told, natural products and supplements simply have less side effects than pharmaceuticals. Anyone who debates this is either uninformed, or totally biased.
The most common side-effect of any product (or food for that matter) that we ingest is stomach or intestinal upset — which only serves to reason. Rarely are these side-effects extremely harmful, and most often using a smaller dosage or taking a product with food alleviates these symptoms.
We are all aware of food allergies, and basically natural products and supplements can be thought of as foods. Allergic symptoms typically take the form of skin rashes, vomiting, headaches, etc. As with any new substance we introduce in our bodies, it’s always prudent to be aware of potential adverse effects.
Having said all of this — the overwhelming evidence supports the assertion (and fact) that natural products have far far less potential side-effects than pharmaceuticals. One only has to listen to drug commercials to be reminded of this fact.