The supplement directory

Amazon's top D3+K2 pick: vegan lichen D3 plus MK-7 K2 in coconut MCT oil; the 5,000 IU dose exceeds the adult upper limit for daily use.

The cereal-and-dessert flavor king: a fully disclosed whey blend with 25 g protein per scoop, but no third-party certification and a premium price.

A true zero-carb whey isolate: 25 g of protein plus a broad vitamin and mineral blend in a 110-calorie scoop, at a price above most rivals.

NSF-certified gummy with a sensible 3 mg melatonin dose, but its L-theanine (50 mg) and botanicals are well below the amounts used in research.

Amazon's best-selling protein shake: 30 g of milk protein for 160 calories at about $2 a shake, but too light to replace a full meal on its own.

The pharmacy-standard rehydration mix: 260 mg sodium, 180 mg potassium and 6 g sugar per 8 oz packet. Dependable when sick, but pricey per ounce.

A nine-nutrient women's multi with vegan D3, methylfolate and 330 mg algal DHA; top-tier transparency, but no iodine or zinc and a premium price.

Coconut-water-based mix with 240 mg sodium, 310 mg potassium and no added sugar, plus published batch test results. Clean and tasty, but pricey per serving.

A budget USDA Organic vegan blend with 21 g protein and 7 g fiber per serving; a 2026 heavy-metals lawsuit against Costco is a key caveat.

A doctor-developed, ORS-style mix with 330 mg sodium per 8 oz, one of the stronger drinks in its class, backed by a small randomized trial. Pricier than it looks.

A flavor-first, beginner-friendly pre-workout with 200 mg caffeine and 200 mg L-theanine; its pump and endurance ingredients are lightly dosed.

The creator-favorite creatine gummy that actually passed independent lab testing, but at about $1.67–$2.00 a serving plus 5 g of sugar per three gummies.

A 24-strain probiotic plus pomegranate prebiotic backed by its own 350-person trial on bloating and gas. Strong science, premium price.

A creamy, lactose-free 26 g milk protein shake built for workout recovery; buyers love the taste, but at $3.50-$3.90 a bottle it's a pricey meal stand-in.

NSF Certified for Sport greens drink with a full multivitamin and 10 billion viable cells of five named probiotics, but over $3 a scoop with two proprietary blends.

A best-selling berry gummy with 800 IU D3, folate and iodine, NSF certified; a partial multi with no iron, little zinc and 2 g added sugar.

1,000 mg sodium, 200 mg potassium and 60 mg magnesium with zero sugar. Excellent for heavy sweaters and low-carb eaters, but far more salt than most desk workers need.

Amazon's mega-seller: 60 billion CFU from 10 species plus prebiotic fiber, third-party tested and cheap. But it names no strains, so it can't be matched to research.

A tasty plant-based shake with 25 g protein, 6 g fiber and 26 vitamins and minerals, but at about $4.66 a serving its long superfood list is mostly undosed.

Portable, sugar-free caffeine gum with a fully disclosed, research-backed pairing: 40 mg of caffeine plus 60 mg of L-theanine in every piece.

A best-selling Magtein supplement at the full 2 g trial dose. Sleep evidence is early and industry-funded, and at about $1 a day it costs far more than other magnesium.

Zero-sugar, stevia-sweetened mix with potassium and magnesium but only 55 mg sodium. Great for flavoring daily water, far too light for heavy sweating or illness.

A USDA Organic, grass-fed dairy shake with 250 calories, 16 g of protein and 20 vitamins and minerals; closer to a light meal than most shakes, but low in fiber.

A budget EAA powder at about $0.67 a serving that includes all nine essential amino acids, but 6 of its 8 g are BCAAs and several others are only token amounts.