While dietary supplements aren’t intended to diagnose, treat, or cure any medical conditions, certain signs may suggest you're not meeting your nutritional needs. These can include feeling unusually tired, noticing irregular digestion and bowel movements, having brittle hair or nails, experiencing poor mobility, noticing changes in mood or focus, etc.
These signs may be related to diet or lifestyle factors. If you’re concerned, it’s best to speak with a healthcare provider, who can help determine whether a supplement may be appropriate for your nutritional support, as well as which one(s).