Single-ingredient guides. For each one we look at what the published human research actually shows, at what dose, over what length of time — and where the evidence is thin, we say so instead of filling the gap with marketing language.
These guides cover ingredients in isolation. For how a specific product uses them — the actual label, the actual dose, the actual price — see our supplement reviews.
Written by Malkiat Singh. See our methodology.
This information is educational and is not medical advice. Talk to your doctor before starting any supplement, especially if you take prescription medication.
Prostate
- Saw Palmetto Alternatives: What the Evidence Actually Supports (2026)
- Stinging Nettle for Prostate Health: The Evidence
- Zinc for Prostate Health: Why ProstaVive Includes It
- Ashwagandha and Prostate Support: What Research Shows
Testosterone & Male Hormones
- Tongkat Ali for Testosterone: What the Evidence Shows
- Tongkat Ali: What the Science Actually Says (2026)
- Fadogia Agrestis: What It Does and the Safety Questions
- Zinc and Vitamin D3 for Testosterone: The Foundations
- Ashwagandha KSM-66 for Male Hormones and Stress
Blood Sugar
- Berberine HCl for Blood Sugar: The Evidence
- Cinnamon in Blood Sugar Formulas: Does It Work?
- Chromium for Insulin Sensitivity: The Evidence
- Gymnema Sylvestre for Blood Sugar: What It Does
- Maca and African Mango for Blood Sugar and Energy
Circulation & Nitric Oxide
- L-Arginine in Nitric Oxide Supplements: What to Know
- L-Citrulline for Circulation and Pumps: The Evidence
- Best Nitric Oxide Supplements: What to Look For in 2026
- Foods That Boost Nitric Oxide Naturally
- Nitric Oxide Supplements for Erectile Dysfunction: What Works, What’s Dangerous