For general nutrition, the best team is:

Doctor: checks your overall health, medications, blood pressure, cholesterol, blood sugar, kidney/liver function, and possible deficiencies.
Registered Dietitian Nutritionist — RDN: gives practical food plans and meal guidance tailored to your goals.

You should definitely check with a doctor if you:

• Take prescription medications

• Have high blood pressure, diabetes, kidney disease, heart disease, cancer history, GI issues, or anemia

• Are considering high-dose vitamins, herbal supplements, “detox” products, or multiple supplements

• Have unexplained fatigue, weight loss/gain, digestive issues, cramps, or weakness

• Want bloodwork to check vitamin D, B12, iron/ferritin, thyroid, glucose/A1C, cholesterol, etc.

NIH advises getting healthcare provider approval before using supplements to treat a condition or combining supplements with prescribed medicines. Mayo Clinic also recommends talking with a healthcare team or dietitian about whether supplements are right for you and whether they could affect medicines you take.

A good question to ask your doctor is:

“Based on my age, diet, medications, and bloodwork, do I actually need vitamin D, B12, iron, magnesium, omega-3, or a multivitamin?”

That keeps supplementation targeted instead of guessing.