We stock vitamins and supplements at every store, and more usefully, there is a pharmacist standing next to the shelf who can tell you whether what you are about to buy is a good idea.
Why ask first
Supplements are not inert. St John’s wort changes how a long list of prescriptions work. Vitamin K affects warfarin. High-dose calcium and iron stop some antibiotics and thyroid medicines being absorbed if you take them at the same time. None of that is on the label in a way that helps you.
What we are asked most
- Whether a supplement interacts with a prescription
- What to take for a deficiency a blood test picked up
- Whether a brand is worth the extra money
- What to take alongside a medication that depletes something — metformin and B12, for instance
- What is safe in pregnancy or while breastfeeding
What we will tell you honestly
If there is no good evidence something works, we will say so. If a cheaper product has the same active ingredient at the same dose, we will point at it. We would rather you trusted the advice than bought the bottle.
Ask before you buy
The supplement aisle is built to sell, and a great deal of what is on it does very little. A pharmacist will tell you honestly which of these is worth your money for your situation — including when the answer is none of them.
Why it matters that we see the list
Supplements are the single most common thing people leave out when we ask what they take, because they are not thought of as medicines. They interact like medicines.
- St John’s wort interferes with a long list of prescription drugs, including some contraceptives and antidepressants.
- High-dose fish oil matters if you are on a blood thinner.
- Vitamin K affects warfarin.
- Calcium and iron can block the absorption of other medicines if taken at the same time — often a timing fix rather than a reason to stop.
- Potassium matters if you take certain blood pressure medicines.
None of these mean you cannot take a supplement. Most are a question of dose, timing, or knowing to watch for something. They only get managed if we know about them.
When a supplement is genuinely indicated
Sometimes it is the medicine that creates the need — long-term metformin and vitamin B12 is the common example, and there are others. That is the kind of gap a medicine review is for.
Supplements are not reviewed by the FDA the way medicines are, so strength and purity vary between brands more than people expect. If you are going to take one, it is worth asking which brands are reliable.
Just ask
Bring the bottle, or a photo of the label. Talk to one of our pharmacists — no appointment, no charge, and no obligation to buy anything from us.