Do I actually need supplements?

Maybe. But starting a GLP-1 does not automatically enroll you in a twelve-bottle subscription to wellness.

Start with the gap: are you unable to eat enough variety, missing a nutrient because of your eating pattern, dealing with a diagnosed deficiency, or trying to meet a practical protein need? Those are better reasons than “someone online said everybody needs this.”

What winter in Boston has to do with vitamin D

In a classic experiment, winter sunlight in Boston did not produce vitamin D precursors in the exposed human-skin samples from November through February. Geography and season really do matter. But the popular “37th parallel” idea is a shortcut—not a magic line that diagnoses everyone north of it as deficient.

Now the other half: in the VITAL fracture study, 2,000 IU of vitamin D daily did not reduce fractures in generally healthy midlife and older adults who weren’t selected for vitamin D deficiency. Treating a genuine deficiency and adding more to an already adequate intake are different questions.

Buy for a reason

A supplement may be useful when food isn’t meeting a need. Decide with your clinician whether diet review or targeted testing would help, then choose an appropriate product and dose. A multivitamin is not a replacement for meals, and stacking multiple products can duplicate ingredients.

NIH’s vitamin D guidance also explains why excess intake can be harmful. “If some is good, more must be better” is how a reasonable idea acquires an unnecessary side effect.

My standard: know why you’re taking it, what benefit is realistic, and when to reassess. Yes, I sell supplements. I should still be able to tell you when you don’t need one.

Want to look more closely at possible gaps? Read the vitamins and minerals answer.

Sources checked September 19, 2026. General education; your own care plan comes from your clinician.