The Best Ashwagandha Supplements: What a COA Should Show

The ashwagandha aisle is the most scam-prone in the store — the herb’s popularity attracted every corner-cutter in the industry. Studies analyzing commercial ashwagandha products have found everything from missing actives to adulterated material. This page is the antidote: exactly what a trustworthy bottle shows.

Requirement 1: a named, standardized extract

Acceptable labels say one of:

• KSM-66 — root-only, 5% withanolides, the deepest trial record
• Sensoril / ashwagandha (root & leaf), 10% withanolides — fewer but solid trials
• Shoden — a newer 35% withanolide extract, early evidence, premium price

Reject: “ashwagandha root powder 500 mg+” with no standardization. That’s agricultural product, not a supplement.

Requirement 2: a real COA

The Certificate of Analysis (how to read one — our guide) should show:

• Withanolide % matching the claim (5% for KSM-66-class, 10% for Sensoril-class)
• Heavy metals under limits — especially lead; ashwagandha is a soil-concentrating plant and lead contamination is this category’s most documented sin
• No adulterants — withaferin A spikes beyond expected ranges signal wrong plant parts

Requirement 3: honest dose math

• KSM-66: 300–600 mg/day — the trial range for stress and sleep (dosing detail)
• Sensoril: 125–250 mg/day
• And the exclusions don’t move for any brand: pregnancy, thyroid, autoimmune — the honest list.

Bottom line

Named extract + published COA + trial dose = a legitimate product. Anything else is a coin flip with your thyroid. Compare current tested brands via the category link; our top picks page explains where ashwagandha fits among the options.