Goal

Energy

Nutrients involved in energy metabolism. Supplements generally only make a noticeable difference when someone is low in a nutrient; persistent fatigue has many causes and deserves a medical conversation.

Ingredients researchers have studied

VITAMIN

Vitamin B12

Vitamin B12 is needed for red blood cell formation, nerve function and DNA synthesis. It is found naturally almost only

Studied for: Preventing or correcting deficiency

MINERAL

Iron

Iron is a mineral needed to make hemoglobin, which carries oxygen in the blood. Iron needs differ widely by age, sex and

Studied for: Iron-deficiency anemia

MINERAL

Magnesium

An essential mineral sold in many salt forms — glycinate, citrate, oxide and more — with very different elemental amounts.

Studied for: Meeting magnesium needs · Occasional constipation (certain forms)

NUTRIENT

CoQ10

Coenzyme Q10 is a compound the body makes that is involved in cellular energy production. Supplements come as ubiquinone

Research in progress

Products

Harbor & Pine Magnesium Glycinate (Buffered) 240 mg

Harbor & Pine · Demo

Primary ingredient: Magnesium Glycinate
Per serving: 240 mg elemental magnesium
Servings: 90
Format: Capsules
Price: $19.49*
Per serving cost: $0.22

Not verified

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Harbor & Pine Magnesium Citrate 150 mg

Harbor & Pine · Demo

Primary ingredient: Magnesium Citrate
Per serving: 150 mg elemental magnesium
Servings: 60
Format: Capsules
Price: $14.99*
Per serving cost: $0.25

Not verified

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Harbor & Pine Magnesium Oxide 250 mg

Harbor & Pine · Demo

Primary ingredient: Magnesium Oxide
Per serving: 250 mg elemental magnesium
Servings: 100
Format: Tablets
Price: $8.99*
Per serving cost: $0.09

Not verified

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Northfield Labs Magnesium Glycinate 200 mg

Northfield Labs · Demo

Primary ingredient: Magnesium Glycinate
Per serving: 200 mg elemental magnesium
Servings: 60
Format: Capsules
Price: $24.99*
Per serving cost: $0.42

Manufacturer claim only

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Guides

LABEL BASICS

How to Read a Supplement Label

Serving size, amount per serving, ingredient form, other ingredients and testing information — in the order that matters.

This page is educational and is not medical advice. Talk to a healthcare professional before starting a supplement, especially if you have a medical condition, take medications, or are pregnant or breastfeeding.