How to choose a good ashwagandha

Reading an ashwagandha label well means checking four things: the form (whole root powder or standardized extract), whether any withanolide percentage is actually backed by testing, what else is in the capsule, and price per day at label directions rather than per bottle. Electric Tiger's capsule is organic whole root powder, and it's measured against this same checklist below, including where it falls short.

1. Check the form: root powder or extract?

"Ashwagandha" on a label can mean two genuinely different products. Whole root powder is dried root, ground, nothing concentrated or removed. A standardized extract — KSM-66, Sensoril and Shoden are the most common branded ones — is processed to concentrate the root's compounds, then standardized to a stated percentage. A milligram of one isn't equivalent to a milligram of the other; an 8:1 extract, for example, carries roughly eight times the concentration per milligram that the same weight of whole root powder does. Electric Tiger's capsule is organic whole root powder — 650 mg/capsule, 1,300 mg/day at label directions — not an extract. Neither form is inherently "better"; they're different products, and the label should say plainly which one you're buying. See types of ashwagandha compared for the full comparison.

2. Don't take a withanolide percentage at face value

A withanolide percentage on a label is meant to tell you how concentrated the active compounds are. A 2025 lab analysis tested 24 commercial ashwagandha products — extracts and root powders both — by mass spectrometry and found the actual measured withanolide content deviated from the label's stated percentage by a factor of 2 to as much as 35. A printed number isn't automatically trustworthy without a certificate of analysis behind it. Our own label prints no withanolide percentage, because we don't hold a certificate of analysis stating one for this root powder — that's a real gap, not a formality, and it's one reason to ask any brand, ours included, whether a number is backed by testing before assuming it.

3. Check what else is in the capsule

Look at the full ingredient list, not just the headline ingredient. Electric Tiger's capsule adds 5 mg of organic black pepper fruit powder — not a piperine-standardized extract, and no piperine percentage is stated, so the actual piperine content of that 5 mg isn't known. No study we found tests whether this amount changes ashwagandha's absorption, so that isn't a claim we make. Check whether a product's capsule shell, fillers or flow agents matter to you (ours uses pullulan capsules), and whether it's labeled organic, vegan, or gluten-free if those matter for your diet.

4. Compare price per day, not per bottle

Bottles vary in capsule count, capsule strength, and how many capsules a label directs per day — a bigger bottle or a higher per-capsule milligram number doesn't automatically mean a better value. Divide the bottle's price by the number of days it actually covers at label directions to compare fairly across brands.

5. Third-party testing

A certificate of analysis from an independent lab is the only way to verify what's actually in a capsule — including a withanolide percentage, if one is claimed. Ask any brand you're considering whether one exists and is available to see.

Questions people ask

How do I know which ashwagandha supplement is good?

What counts as good depends on what you're optimizing for — form, dose, price, or certification — more than any single brand. Use the checklist above to compare options against your own priorities rather than a ranking.

Where can I buy ashwagandha?

Ashwagandha supplements are widely available online and in most supplement retailers, in both root-powder and extract form. Whichever source you use, check the label against the criteria above before buying.

What's the best time to take ashwagandha?

That's a separate question from choosing a product — see when is the best time to take ashwagandha? for label directions and timing.

What's the best way to take ashwagandha?

Follow the label directions for whatever product you buy. Ours directs one capsule twice a day, 20–30 minutes before a meal with an 8 oz glass of water.

Which ashwagandha is best — root or leaf?

Some extracts (Sensoril, Shoden) use a root-and-leaf blend rather than root alone; the two haven't been tested head-to-head for any outcome in the research we reviewed. See types of ashwagandha compared for what's actually been studied in each form.