Verified Supplement Data

The best supplement to buy, and the proof behind each pick

We read the labels, check the public testing lists, and compare what a real dose costs. No brand pays to rank.

Picks by Erin Rose How we score

Most read: CreatineCollagenMagnesiumFish oilProtein powderVitamin D

  • 555 products scored
  • 5 testing lists checked
  • 94 supplement guides

  1. Our creatine pick

    Naked Creatine

    • Testing listNSF/ANSI 173
    • Our score10.0/10
    • Cost$0.18 a day
    See everything we checked

Our picks for the supplements people buy most

Each pick comes from a full guide that compares it with the other options.

  1. Best creatine

    Naked Creatine

    • NSF/ANSI 173
    • $0.18 a day

    One scoop is 5 g of creatine monohydrate, inside the 3 to 5 g a day studies use, and it is the only ingredient on the label.

    See why we pick itAmazon price

  2. Best collagen

    BulkSupplements Bovine Collagen

    • NSF Certified for Sport
    • $0.56 per 10 g

    Plain hydrolyzed collagen from cows with no flavor and nothing else added, so a scoop stirs into coffee.

    See why we pick itAmazon price

  3. Best magnesium

    Revive MD Magnesium Glycinate

    • Informed Sport
    • $0.33 a day

    Glycinate is the form many people choose because it is gentle on the stomach, and this one gives 200 mg of magnesium in 2 capsules.

    See why we pick itAmazon price

  4. Best fish oil

    Viva Naturals Triple Strength

    • IFOS
    • $0.30 per 1,000 mg

    About 1,000 mg of EPA and DHA in each softgel, so you take fewer pills for the same dose.

    See why we pick itAmazon price

  5. Best protein powder

    Naked Whey

    • Informed Choice
    • $1.84 per 25 g of protein

    25 g of protein a scoop, and whey is its only ingredient, with no sweetener or flavor.

    See why we pick itAmazon price

  6. Best vitamin D

    NatureWise D3 2,000 IU

    • NSF/ANSI 173
    • $0.04 a day

    2,000 IU is the daily dose the largest vitamin D trial used, and it stays under the 4,000 IU daily limit.

    See why we pick itAmazon price

More of our picks

  1. Best ironNature Made Iron 65 mg $0.06 a day Amazon price
  2. Best electrolyte powderRedmond Re-Lyte $0.95 per 1,000 mg sodium Amazon price
  3. Best lion’s maneNootropics Depot Lion’s Mane 8:1 $0.43 per 100 mg beta-glucan Amazon price
  4. Best B12NatureWise B12 1,000 mcg $0.12 a day Amazon price
  5. Best multivitaminNature Made Multi Complete with Iron Amazon price
  6. Best ashwagandhaTransparent Labs KSM-66 $0.33 a trial day Amazon price

See all 94 supplements, A to Z

How we pick

  1. 1

    We read the label

    We read each label to find the real dose in a serving. When NIH’s label database lists the product, we check it there too.

  2. 2

    We check the testing lists

    We look each product up on USP, NSF and Informed Choice. These groups test products: some check that the bottle matches the label, some check for drugs banned in sport.

  3. 3

    We compare the cost

    We compare the cost of the same dose, not the price of the bottle, so a cheap bottle with a tiny dose does not win.

Testing status comes from the lists above. Found a mistake? See our corrections.

Other ways to choose

Only tested brands

Two brands side by side

How much to take

A certain kind

Have a bottle in hand? Look up its label in NIH’s database.

Buying for your dog? See dental chews, joint supplements and probiotics for dogs, or all our dog guides.

Health information from published research, not medical advice. Talk with your doctor before you start a supplement, especially if you take medicine. Medical disclaimer.