Reference · Physician conversations

Questions to bring to your physician appointment

A short, printable guide to the supplement-related questions worth raising — written by Dr. Brennan Commerford, D.C., based on 12 years in practice watching how patients and physicians actually talk about supplements.

Why this guide exists

Most supplement appointments go badly for the same reason: the patient brings a label, the physician asks two questions, and there's no shared language for the part that actually matters — the form of each ingredient, the dose, and what's worth tracking on a lab.

I spent 12 years in practice on the other side of those conversations. The questions below are the ones I wish more patients had brought to their appointments. They aren't meant to challenge your physician. They're meant to give the conversation enough specificity that the answer you walk out with is actually useful.

What's worth bringing up

Biomarkers — a handful of lab values that come up in supplement conversations more than most others.
Ingredient forms — when two products list the same milligrams of "magnesium" or "B12," they may not behave the same way in your body. Form is the part the bottle usually doesn't tell you.

Take this with you

Bring this to your appointment

Are there any labs you'd like me to run before I make changes to my supplements?
What target ranges are you tracking for me, and how often do you re-test?
I'm taking [list ingredients]. Are any of them worth discussing alongside my current medications?
If I'm changing the form of an ingredient (e.g., D2 to D3, magnesium oxide to glycinate), should we re-test before adjusting dose?
Are there any forms you'd specifically prefer I avoid given my history?
Is there a dose ceiling for any of these you'd like me to stay under?
Anything you'd want me to bring back to a follow-up so we can see if the change is doing what we hoped?

Section 1

Biomarkers worth discussing

Four lab values that come up in physician conversations about supplements more than most others. Whether your physician should track any of them, what the target ranges are, and what to do about a result is a conversation for the appointment — not a marketing email.

25-OH Vitamin D

The standard lab for vitamin D status. Many physicians track this for patients who supplement, are over a certain age, or have limited sun exposure. The reference range a lab reports and the range your physician targets for you may not be the same — that's worth asking about directly.

Questions worth asking

What 25-OH Vitamin D range do you target for someone like me?
If I'm supplementing, how often would you want to re-check?
Is there anything in my history that would change the form of vitamin D you'd recommend (D2 vs D3)?

B12

The two most common supplement forms — methylcobalamin and cyanocobalamin — are absorbed and metabolized differently. Some physicians have a preference based on patient history (MTHFR variants, absorption issues, age). It's a question that takes 30 seconds at an appointment and is rarely volunteered.

Questions worth asking

Do you have a preference between methylcobalamin and cyanocobalamin for me?
Is there a serum B12 or methylmalonic acid value you'd want to see before or after a dose change?

Magnesium (RBC vs serum)

Most labs report serum magnesium. Some physicians prefer red-cell (RBC) magnesium when assessing a patient's status because the two tests can show different things. Which one your physician orders — and why — is worth understanding before you supplement.

Questions worth asking

When you check magnesium, do you typically order serum or RBC?
Is there a form of magnesium you'd specifically prefer for me?

Homocysteine

Some physicians check homocysteine when they're thinking about B-vitamin metabolism, especially the methylated forms. Whether your homocysteine warrants attention — and how to address it if it does — is a conversation for your physician, not the supplement aisle.

Questions worth asking

Is homocysteine something you'd want to check for me before changing B-vitamin forms?
If I'm taking methylated B-vitamins, is there anything you'd want to monitor?

Section 2

Ingredient forms worth asking about

For some ingredients, the form on the label changes how much your body actually absorbs. Research has compared these forms head-to-head. The differences are often large. The forms below come up in physician conversations often enough to be worth bringing up by name.

Vitamins

Folate

Folic acid is the synthetic form. Methylfolate (5-MTHF, sometimes branded as Quatrefolic®) is the active form. People with MTHFR variants metabolize the two differently, and some physicians have a strong preference based on that history.

Question worth asking: Have you ever had me tested for MTHFR, and does that change the form of folate you'd want me on?

Vitamin K

K1 (phylloquinone) and K2 (menaquinone) are studied for different roles. Within K2, MK-4 and MK-7 are reported to differ in circulation time. Whether one is more appropriate than the other for you is a judgment call your physician makes.

Question worth asking: If I'm supplementing K2, do you have a preference between MK-4 and MK-7?

Minerals

Magnesium

Oxide is the cheapest form and the most common one in store-brand multis. Research comparing oxide head-to-head with organic forms like glycinate, citrate, and malate has reported lower absorption for the oxide form (Firoz & Graber, Magnes Res 2001; Walker et al., Magnes Res 2003). Magnesium L-threonate is studied separately for its delivery profile.

Question worth asking: Is there a magnesium form you'd specifically recommend or avoid for me?

Iron

Ferrous sulfate is widely used and has a long research history, but GI tolerance varies between individuals. Bisglycinate (chelated) is studied for tolerance in some populations. If you've had GI issues with iron before, that's worth bringing up.

Question worth asking: I've had [tolerance / no issues] with iron in the past — is there a form you'd recommend I try?

Zinc

Picolinate, bisglycinate, citrate, and oxide differ in how they're absorbed. Zinc also competes with copper at the gut, so very high zinc intake can affect copper status — a balance most physicians watch.

Question worth asking: If I'm supplementing zinc longer-term, is there a copper level you'd want to keep an eye on?

Other functional ingredients

CoQ10

Two forms: ubiquinone (the oxidized form, more stable, capsule-friendly) and ubiquinol (the reduced form, studied for absorption — particularly in older adults). Manufacturing constraints make ubiquinone the standard in most products.

Question worth asking: Do you have a preference between ubiquinone and ubiquinol for me?

Omega-3

The form matters: triglyceride (TG), ethyl ester (EE), phospholipid (krill), and free fatty acid (FFA) are absorbed differently. The EPA-to-DHA ratio also varies between products. Form and ratio are both worth understanding before you pick a fish-oil product.

Questions worth asking

Do you have a preference on omega-3 form (TG vs EE vs phospholipid)?
Is there an EPA:DHA ratio that fits what I'm doing?

Curcumin

Standard curcumin is reported in the literature to be poorly absorbed without a delivery system. Several formulated forms — LONGVIDA®, Meriva® (phytosome), BCM-95®, HydroCurc® — have been studied for absorption. The form on the label and the dose have to be read together.

Question worth asking: If I'm using curcumin, is there a particular formulation you'd recommend?

Sharing your formula with your physician

The simplest way to bring your FormulaForge formula to an appointment is to print the formula page or take a screenshot and bring it on your phone. Your formula page lists every ingredient, the form, the dose, and the source — exactly the information a physician needs to ask the right questions.

A dedicated PDF export is coming. Until then, print or screenshot is the move.

Build your formula

When you're ready, the Formula Builder selects a research-supported form for each ingredient based on its bioavailability profile. You choose the doses; we show our work.

Open the Formula Builder Read about our four dose zones