Ingredient library
Start with the health or ingredient question on your mind. These chapters explain nutrient roles, formula differences and how to read the products in our catalog.
Your reading path
New to supplements? Begin with Supplement Facts and comparing formulas. Know an ingredient? Open its chapter, then compare the products linked at the end.
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Magnesium: muscle, nerve function and understanding supplement forms
A mineral guide: what magnesium does, how forms differ, and why compound weight is not the same as elemental magnesium.
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Zinc: immune function, label amounts and choosing a formula
Understand zinc’s nutritional role and how to compare zinc formulas without assuming a bigger amount is better.
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Vitamin D: bone health, D3 and understanding IU and micrograms
Learn what vitamin D does and how to read D3 amounts, supporting ingredients and serving information.
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B-complex supplements: read the individual vitamins, not just the name
A practical guide to comparing B-complex labels and understanding what a multi-vitamin formula actually contains.
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Herbs and extracts: plant names, plant parts and formula differences
Learn how to read botanical formulas and distinguish a plant ingredient from an extract or a blend.
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How to read Supplement Facts: serving size, amounts and ingredients
Use a supplement label to understand the formula, the serving and what a bottle actually contains.
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Bottles, samples and refills: choosing the format you actually want
Understand what changes between product formats, then compare the exact quantity, formula and price.
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How to compare supplement formulas before choosing a brand
A clear order for comparing ingredient identity, amounts, other ingredients, evidence and price.
Explore the catalog when you are ready
Browse ingredients · Products A–Z
Guides provide general education from Green Organic Supplements. They do not establish that you need a supplement or that a particular formula treats a condition.