How to Read Supplement Labels Like a Pro (Not a Marketing Brochure)



You train smart. You fuel with intention. You periodize your workouts.

So why do so many supplements still get a free pass?

If you’ve ever flipped over a bottle and thought “This should not require a PhD”—this blog is for you. Learning how to read supplement labels is a performance skill, not a wellness trend. And once you know what to look for, you’ll never un-see it.




Step 1: Start With the Medicinal Ingredient List (Not the Hype)

The front label is marketing. The back label is data.




1. Check the dose (not just the ingredient)

An ingredient is only as good as its dose.



Ask:

  • Is this dose clinically relevant, or pixie dust?

  • Does the research support this amount for this outcome for people like me?


Example:

  • Magnesium at 50 mg per capsule looks impressive… until you realize therapeutic dosing is often 300–400 mg/day.




2. Look at dose per capsule, not per serving

This is where brands get sneaky.



  • “Serving size: 4 capsules”

  • Actual dose per capsule: underwhelming



For athletes and busy humans, needing 6–8 capsules per day matters—for compliance, digestion, and cost.

One brand may seem more expensive given its price tag, but when you do the math of cost per dose then the cheap bottle may actually end up costing you more OR require you to swallow a huge handful of capsules.



For example:

Bottle A is $25 and contains 60 capsules. You need 2 capsules per day to get therapeutic dose. That $25 will cover 1 month (30 days).

Bottle B is $25 and contains 180 capsules. Sounds like a deal – same price, with 3x more capsules! Therapeutic dose is 6 caps per day. So this bottle will last 30 days (180/6).



Both brands will last 30 days.

Both brands are $25



But brand B you need to swallow 6 caps per day instead of 2 as per brand A.




3. Evaluate the form or format

Not all forms are created equal – or have the same function.



Examples:

  • Vitamin B12: methylcobalamin > cyanocobalamin

  • Magnesium: glycinate, malate, threonate > oxide

  • Iron: bisglycinate > ferrous sulfate



The form affects:

  • Absorption

  • Tolerance

  • Clinical effect


Better form = better results with fewer side effects.

The right form for your health concerns and goals is money well spent.



Specifically, looking at magnesium (a popular one for us athletes):

  • Magnesium oxide – poorly absorbed, makes a great laxative.

  • Magnesium threonate – crosses the blood-brain-barrier very well suited to support cognitive function, brain health and sleep issues.

  • Magnesium malate – well absorbed especially in muscle tissues so a perfect choice for muscle pain, fibromyalgia, chronic fatigue syndrome.

  • Magnesium glycinate (or bisglycinate) – very well absorbed and easy on the stomach. A favourite “general magnesium” as it’s useful for repleting magnesium deficiency, reduces sleep issues, anxiety and muscle cramps.




4. Assess the quality of herbs

Herbs aren’t just “plant matter.”


Look for:

  • Standardized extracts (e.g., “with 5% withanolides”)

  • Latin names (e.g., Withania somnifera)

  • Plant part used (root vs leaf matters)


If none of this is listed, quality is… questionable.


Think about it. If you had never heard of a “banana” and someone told you “bananas tasted yummy”, what would you do? Eat the leaf? Gnaw on the root? Eat the whole banana fruit with peel? Eat only the banana fruit?





Step 2: Don’t Ignore the Non-Medicinal Ingredients (They Matter)

Non-medicinal ingredients are often treated like background noise. For athletes, gut-sensitive humans, and hormone-aware women—they’re not.




Fillers

Used to bulk up capsules or powders.


Common examples:

  • Microcrystalline cellulose

  • Dicalcium phosphate


Small amounts are usually fine—but excessive fillers can displace active ingredients or irritate sensitive guts.



Additives

These improve shelf life or texture.


Examples:

  • Magnesium stearate

  • Silicon dioxide


They’re not inherently “bad,” but high-quality supplements use minimal additives, not a chemistry set.



Flavourings

Mostly relevant for powders.

  • “Natural flavours” = vague and poorly regulated

  • Artificial flavours can worsen GI symptoms in endurance athletes


If your gut is already under stress, this matters.



Binders

Help tablets hold their shape.



Examples:

  • Starches

  • Gums

Too many binders can reduce disintegration, meaning the supplement may pass through without being fully absorbed.



Colouring Agents

Purely cosmetic.


Examples:

  • Titanium dioxide

  • Artificial dyes, FD&C yellow 5


These add zero performance benefit and can increase inflammatory or gut burden—especially with daily use.




Other Ingredients to Watch

  • Sweeteners (sucralose, aspartame) – all of which have been shown to disrupt gut microbiome

  • Hydrogenated oils

  • Unnecessary sugars


Ask yourself: What role does this play in my health or performance?





Step 3: Apply a Critical Lens (Like You Do With Training Programs)

If you wouldn’t follow a workout with:

  • No progression

  • No evidence

  • No clear dosing


Why accept that from a supplement?



A high-quality supplement should:

  • Have transparent dosing

  • Use evidence-based forms

  • Minimize unnecessary extras

  • Respect your gut, hormones, and nervous system




The Bottom Line

Reading supplement labels isn’t about perfection—it’s about informed decisions.

You don’t need more supplements.


You need better ones, used with intention.



Train hard. Recover harder.

And read the damn label. 💪✨



High fives,

Dr. Andrea