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The Check Supplement Clinical Selection

We analyze thousands.
These made the cut.

The same research that powers this platform informs our product selection. No affiliate deals influencing our picks. No filler brands. Just the formulas we'd take ourselves. And do.

Third-Party Tested
Clinical Doses
USA Manufactured
No Proprietary Blends

Our Selection Standards

Most supplement brands prioritize margins over efficacy. We do the opposite. Here's what it takes to make our selection.

Research-Backed

Every formula is based on peer-reviewed clinical studies. We only include ingredients with meaningful human trial data.

Clinical Doses

No pixie-dusting. Every ingredient is dosed at levels shown to be effective in research. Not just enough to put on the label.

Third-Party Tested

Independent labs verify purity, potency, and heavy metal content. Every batch. No exceptions.

Premium Forms

We use bioavailable forms that your body can actually absorb. Chelated minerals. Methylated B-vitamins. Active compounds.

USA Manufactured

Made in FDA-registered, GMP-certified facilities in the United States. Full supply chain transparency.

No Fillers or Junk

No artificial colors, no unnecessary binders, no proprietary blends hiding underdosed ingredients.

The Check Supplement Promise

We formulate based on science, not trends. Every product here has been vetted by the same standards we use to analyze any supplement on this platform. If it doesn't pass our analysis, we won't sell it.

30-day money-back guarantee
Free shipping over $50
Subscribe & save 15%

Curated Protocols

Not sure where to start? These synergistic combinations are designed to work together for specific outcomes.

Deep Sleep Protocol

Fall asleep faster, sleep deeper, wake refreshed

Save 10%

Magnesium Glycinate

Magnesium 400mg

$24.99

Ashwagandha KSM-66

Ashwagandha 600mg

$24.99

Protocol Total

$44.98$49.98

Get Protocol

Mental Clarity Protocol

Sharper thinking, better memory, sustained focus

Save 15%

Omega-3 Fish Oil

EPA 800mg • DHA 600mg

$34.99

Active B-Complex

B1 (Thiamine) 100mg • B2 (Riboflavin) 100mg • B3 (Niacin) 100mg • B5 (Pantothenic Acid) 100mg • B6 (P-5-P) 50mg • B12 (Methylcobalamin) 1000mcg • Folate 800mcg

$27.99

Lion's Mane Complex

Lion's Mane 1000mg

$34.99

Protocol Total

$83.27$97.97

Get Protocol

Sustained Energy Protocol

All-day energy without crashes or jitters

Save 15%

Active B-Complex

B1 (Thiamine) 100mg • B2 (Riboflavin) 100mg • B3 (Niacin) 100mg • B5 (Pantothenic Acid) 100mg • B6 (P-5-P) 50mg • B12 (Methylcobalamin) 1000mcg • Folate 800mcg

$27.99

Creatine Monohydrate

Creatine 5g

$29.99

CoQ10 Ubiquinol

CoQ10 200mg

$44.99

Protocol Total

$87.52$102.97

Get Protocol

Longevity Foundation

The essentials most adults are missing

Save 15%

Magnesium Glycinate

Magnesium 400mg

$24.99

Vitamin D3 + K2

Vitamin D3 5000 IU • Vitamin K2 200mcg

$29.99

Omega-3 Fish Oil

EPA 800mg • DHA 600mg

$34.99

Protocol Total

$76.47$89.97

Get Protocol

The Complete Selection

Every formula, individually or in combination. Pick what fits your protocol.

Magnesium Glycinate

CAPSULE

Clinical-dose chelated magnesium for optimal absorption

Magnesium 400mg
Clinical DoseThird-Party Tested

$24.99

60 servings ($0.42/serving)

Vitamin D3 + K2

SOFTGEL

Synergistic D3+K2 for bone & cardiovascular health

Vitamin D3 5000 IUVitamin K2 200mcg
Synergistic FormulaMK-7 Form

$29.99

90 servings ($0.33/serving)

Omega-3 Fish Oil

SOFTGEL

Molecularly distilled, high EPA+DHA concentration

EPA 800mgDHA 600mg
Molecularly DistilledHeavy Metal Tested

$34.99

60 servings ($0.58/serving)

Zinc + Copper Balance

CAPSULE

Balanced zinc-to-copper ratio for long-term use

Zinc 30mgCopper 2mg
Balanced RatioChelated Forms

$19.99

60 servings ($0.33/serving)

Active B-Complex

CAPSULE

Active methylated B-vitamins for optimal utilization

B1 (Thiamine) 100mgB2 (Riboflavin) 100mgB3 (Niacin) 100mgB5 (Pantothenic Acid) 100mgB6 (P-5-P) 50mgB12 (Methylcobalamin) 1000mcgFolate 800mcg
Methylated FormsActive B6 & B12

$27.99

60 servings ($0.47/serving)

Ashwagandha KSM-66

CAPSULE

Gold-standard KSM-66 extract for stress & performance

Ashwagandha 600mg
KSM-66 ExtractFull-Spectrum

$24.99

60 servings ($0.42/serving)

Creatine Monohydrate

POWDER

Creapure® German-made creatine for strength & cognition

Creatine 5g
Creapure®Micronized

$29.99

60 servings ($0.50/serving)

Marine Collagen Peptides

POWDER

Hydrolyzed marine collagen for skin, joints & gut

Collagen Peptides 10g
Marine SourceType I & III

$39.99

30 servings ($1.33/serving)

CoQ10 Ubiquinol

SOFTGEL

Active ubiquinol form for superior absorption

CoQ10 200mg
Ubiquinol Form8x Better Absorption

$44.99

60 servings ($0.75/serving)

Lion's Mane Complex

CAPSULE

Dual-extract for cognitive support & nerve health

Lion's Mane 1000mg
Dual ExtractHot Water + Alcohol

$34.99

60 servings ($0.58/serving)

Not sure what you need?

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