An independent supplements reference, online since 2002

The Vitamins & Supplements Guide is an independent, non-commercial reference covering 283 vitamins, dietary minerals, herbal supplements, amino acids, hormones, enzymes and other nutrients. Each article follows the same structure: what the nutrient is, its functions and health benefits, dietary sources, typical dosage, deficiency symptoms, and overdose or toxicity information.

Our history

The guide was first published in 2002 and grew through the 2000s into a reference used and cited by encyclopedias, universities and health websites. After the original site went offline, the full archive was restored in 2026 from preserved copies, keeping the original reference articles intact.

Editorial approach

Articles are maintained by the site's editorial team. The restored content reflects the guide's original reference text; we are progressively reviewing articles — starting with dosage and recommended-intake figures — against current published guidance such as the NIH Office of Dietary Supplements fact sheets. Each article shows its original publication era and its most recent review date.

Corrections

If you find an error — factual, typographical or otherwise — pleasecontact us and we will review and correct it.

Medical disclaimer

All articles on this site are for general information only and are not intended to diagnose, treat, cure, or prevent any disease. Nothing here is medical advice. Always consult a qualified health professional before taking any dietary supplement, especially if you are pregnant, nursing, taking medication, or have a medical condition.

What we cover

• Vitamins — Fat- and water-soluble vitamins: sources, benefits, deficiency and toxicity.
• Herbal Supplements — Traditional herbs and botanicals with their uses and side effects.
• Amino Acids — Essential and non-essential amino acids and their roles in the body.
• Hormones — Hormones and hormone-related supplements.
• Dietary Minerals — Macro and trace minerals in human nutrition.
• Phytochemicals — Plant compounds with biological activity.
• Digestive Enzymes — Enzymes that break down food into absorbable nutrients.
• Carbohydrates — Sugars, starches and fibers in the diet.
• Essential Fatty Acids — Omega-3, omega-6 and related fatty acids.
• Nutrients — Other nutrients and nutrition topics.
• Weight Loss — Weight loss supplements and how they work.