Nutrition & Add-Ons

The Supplement Question: When They Earn Their Place

Most supplements never get absorbed because they aren't formulated to be. The few that are can genuinely help — and the formula matters far more than the brand on the bottle.

August 3, 2026 7 min read Coach K

Walk into any pharmacy and you'll see 400 bottles. Most of them won't do what the label promises — and not because the ingredients are wrong. The problem is that most supplements simply aren't formulated to be absorbed. The active ingredient that's supposed to cross your gut wall and go to work gets disposed of in your waste instead. You paid $30 for a bottle of "magnesium" or "B-complex" or "omega-3," the label was technically accurate, and the bioavailability was never there to begin with.

That's the part nobody at the supplement aisle wants to tell you. It's also why so many people give up on supplements after a year — they tried, they felt nothing, they concluded the whole category was a scam. It isn't. The right supplement, at the right potency, in a form your body can actually absorb is a completely different experience — especially when food alone isn't closing the gap. The skill is knowing the difference.

The principle

I'll start with what I actually believe, because I've spent twenty years in this space and I want to be honest about it:

  1. Food first — but be honest about the gap. If you can get the nutrient from food, get it from food. But most people don't eat seven to nine servings of vegetables a day. Most don't hit 100g of protein from real meals. As we age, appetite drops and absorption changes, and the food-only goal gets even harder. Pretending otherwise doesn't help anyone.
  2. The formula matters more than the ingredient name. Magnesium glycinate works differently than magnesium oxide. A clean whey protein is a different product than a sugary mass-gainer wearing the same word. Potency, bioavailability, third-party testing, clean ingredients — these are what decide whether a supplement does anything.
  3. One supplement at a time, four weeks each. Stacks tell you nothing. Add one thing, track how you feel, then decide. The user who tries five new bottles at once has no way to know which one (if any) is helping.

If you can hold those three rules, the rest of the conversation gets useful.

When supplements earn their place

This is the list I'd give a friend, in rough order of "most worth considering" to "most situational."

If your produce intake is low — a greens powder

Most adults don't get close to five servings of produce a day. A good greens powder — concentrated vegetables, fruits, and fiber from real food sources, third-party tested, no junk additives — closes that gap better than a multivitamin pill ever will. Look for a complete ingredient list, not a "proprietary blend."

If your protein intake is low — a clean protein powder

The breakfast meal is the one most people short on protein. A scoop of clean whey or plant protein in milk or water gets you 25g in 30 seconds. Use it as a bridge to real food, not a replacement.

If you're training — creatine monohydrate

3-5g daily. Originally a strength supplement; now also one of the best-evidenced supports for cognition in aging adults and women, plus muscle preservation during dieting. Cheap. Safe for almost everyone with normal kidney function.

If your fish intake is low — omega-3 (EPA/DHA)

2-3 servings of fatty fish a week is the food-first answer. If that doesn't happen, 1-2g combined EPA+DHA per day. Watch for bleeding risk if you're on anticoagulants.

If labs show a deficiency — vitamin D, B12, or iron

Test first. Don't guess. High-dose vitamin D can be toxic. Iron without an actual deficiency drives inflammation. Get the blood work, then supplement based on the gap your doctor identifies.

If sleep tension is the issue — magnesium glycinate

The glycinate form absorbs cleanly and doesn't cause the loose stools that magnesium citrate or oxide can. Discuss with your clinician if you have kidney concerns or take medications it might interact with.

For specific conditions — under physician guidance

Digestive enzymes for chronic bloating. Targeted probiotics for specific GI issues. Fiber supports for constipation. These can genuinely help — but they should be matched to the condition by someone who knows your full picture, not picked off a shelf.

What to actively skip

How to read a supplement label honestly

Three things, every time:

  1. Form of the ingredient. Magnesium glycinate vs oxide. Methylated B12 (methylcobalamin) vs cyanocobalamin. Vitamin D3 vs D2. The form decides absorption.
  2. Third-party testing. Look for USP, NSF Certified for Sport, or Informed Choice on the bottle. These mean an independent lab verified what's actually inside.
  3. Clean ingredient list. If you can't pronounce most of it, or the inactive ingredients are a wall of fillers, dyes, and "natural flavors," there's usually a cleaner version available.

I didn't take supplements at all until my 30s — I ate well, hit my produce, and figured that was enough. Then I started working with Dr. Tim Brantley, a naturopath who'd written a bestseller called The Cure, focused on digestive and gut health. I ran his fulfillment business and tested his formulas on myself — his digestive enzyme blend after heavy meals, his constipation formula after long flights, his detox formula after a weekend with too much wine. All three worked, and worked fast. That was the moment it clicked for me: most supplements never get absorbed because they aren't formulated to be — so people spend money on bottles that end up in their toilet instead of their bloodstream. But the right formula at the right potency with real bioavailability is a completely different animal. Years later I partnered with Dr. Steve Green, a family physician who started a longevity clinic, and built him an online supplement store using his condition-specific protocols. Three years of selling those products to his patients taught me which formulas actually earn their place and which ones are pure marketing. Supplements aren't magic. But the ones that are properly formulated do work. Ask the right question — "what gap am I trying to close, and is this the right product to close it?" — and you'll spend a lot less money on bottles that do nothing.

What to do this week

  1. Audit your shelf. Pull every bottle. For each one, ask: "What gap is this closing? Where's the evidence?" If you can't answer, set it aside.
  2. Pick one to start. Greens powder if your produce is low. Protein powder if you can't hit protein from food. Creatine if you're training. Just one. Four weeks. Notice how you feel.
  3. Schedule labs if you haven't had them in a year. Vitamin D, B12, ferritin, A1c, basic metabolic panel, lipid panel. That's the foundation for any deficiency-based supplement decision. Ask your physician about anything you're considering before you add it.

The reason most supplement routines fail isn't because supplements don't work. It's because people start with five at once, can't tell what's doing what, and give up in 90 days having spent $500 on nothing. One at a time, four weeks each, journaled. That's the only way to know what actually moves the needle for you.


If a friend is sitting on a shelf full of bottles wondering what's worth keeping, send them this. The honest framework beats another sponsored Instagram post every time.

— Coach K

Take the True Health Age quiz →

Educational only. Not medical advice. Supplements can interact with medications and medical conditions. Always talk with a qualified clinician before adding or changing a supplement — especially if you're pregnant, breastfeeding, immunocompromised, on blood thinners, or managing a chronic condition.

Keep reading