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Jarrow Formulas

Jarrow Formulas Ashwagandha (KSM-66), 300 mg

Adaptogen · Capsule · 120 servings

Label snapshot

What the label says

What the product contains and what one serving costs, according to our catalog. Label amounts are not personal dose recommendations.

Extract per serving
Ashwagandha 300 mg
Form
Capsule
List price (catalog, USD)
$28.92
Price per serving
$0.24List price divided by servings per container. A per-day cost only if the label serving is once daily.
Full label record: servings, testing, ingredients
Servings per container
120
Catalog monthly estimate
$7.23
Testing disclosure
No third-party testing listedStatus as recorded in the catalog from brand materials; not independently verified by NO1GEVITY.

Ingredients as listed

IngredientAmount per serving
Ashwagandha300 mg

What to check on the label

  • The extract name and plant part on the label. Extracts are not interchangeable milligram for milligram.
  • The withanolide percentage, if stated.
  • Whether the label gives per-capsule or per-day amounts.

Amounts are per label serving as recorded in the catalog and are not a recommendation. Testing status reflects what the brand lists. Nothing here is medical advice.

Editorial score and research-dose calculations

These calculations describe our scoring method. They are not a recommended dose or proof of benefit from this product.

6.3/10
Overall score
#6 / 9 in Adaptogen

Top 10% value.

Read the evidence (2 studies)
Add to compareVisit brand site →
Watch out
Tier 3
Ingredient RCT (matching dose)
The ingredient was tested in an RCT at the same dose this product sells.
See the 2 supporting studies
How we scored this product Show the full breakdown
Dose vs. studies (50%) Why 7.2 of 10. Primary ingredient is Ashwagandha (evidence grade B). It delivers 300 mg, inside the studied range of 300–1200 mg. Read the rule → 7.2
Transparency (20%) Why 6.0 of 10. Earned points for all doses disclosed. Lost points for no public certificate of analysis and no independent third-party testing. Read the rule → 6.0
Value (10%) Why 9.4 of 10. One day at the trial dose costs about $0.48. That is one of the cheaper options in the catalog (63 of 313 by cost per effective day). Read the rule → 9.4
Formulation (10%) Why 5.0 of 10. No published absorption advantage or disadvantage on file. The default of 5 is not a criticism. Read the rule → 5.0 Default. No absorption data on file.
Safety (5%) Why 5.0 of 10. Baseline 5.0. Third-party testing adds 2.0. Public lab certificate adds 1.5. NSF, USP or Informed Choice certification adds 1.5. Active safety signal subtracts 3.0. Read the rule → 5.0
Community sentiment (5%) Why 6.3 of 10. No external reviews found, so community sentiment defaults to neutral. Community never counts as clinical evidence. Read the rule → 6.3
Composite How this 6.3 is built. 0.50 × 7.2 + 0.20 × 6.0 + 0.10 × 9.4 + 0.10 × 5.0 + 0.05 × 5.0 + 0.05 × 6.3 = 6.3 out of 10. Safety caps applied after. 6.3
6.3 composite
Dose vs. studies50%7.2
Transparency20%6.0
Value10%9.4
Formulation10%5.0
Safety5%5.0
Community5%6.3

Evidence gates dose: the evidence grade sets the ceiling, and the dose decides how much of that ceiling the product reaches. Value = inverse of price-per-trial-dose-day. Community = mean sentiment of external reviews. Safety caps applied after weighting.

This score is our editorial judgment, not a scientific standard. We combine published evidence, dose, price, transparency, and consumer signals into one composite: this is our method, not a peer-reviewed clinical rating. A higher score means a product does better on the factors we weight, not that it is medically proven to work.

Read the full method →

Editorial verdict

Quick verdict

6.3 / 10
Best for
Full trial dose, Budget-friendly
Avoid if
No public lab certificate
Full-dose status
Meets trial dose
Price/month
$7
COA status
Not public
Biggest caveat
No third-party testing, which caps the quality transparency.
Nearest alternatives
Catalog snapshot. Check linked sources for current price, label and batch-specific testing.
Price verification
Current price: $28.92
Last price check: Sep 01, 2026
Add to compareVisit brand site →
Layer 2 · Context
In plain language

Why this scored this way

This Jarrow Formulas Jarrow Formulas Ashwagandha (KSM-66), 300 mg scores 6.8, making it a mid-tier product with both strengths and weaknesses. It delivers 300mg of Ashwagandha, inside the studied range of 300–1200mg with grade B evidence (promising human data, not yet comprehensive). The quality transparency (6.0) is limited by the lack of third-party testing.

What drives the score up

  • Dose-evidence score of 7.2 shows decent alignment with trial doses.
  • Ashwagandha is dosed at the full research level with grade B evidence (promising human data, not yet comprehensive).

What drags it down

  • No third-party testing, which caps the quality transparency.
  • Quality transparency of 6.0 is below the site average.
  • Limited consumer feedback (community score: 6.3).

Why you'd choose it

  • You want good value at $0.48/day.
  • You want Ashwagandha from a Jarrow Formulas product.
  • You want doses that align with published research.

Why you might skip it

  • You want third-party verified purity.
  • You want a product with a publicly available CoA.
  • You want stronger transparency (this scores 6.0).
Question 1

Does the molecule work?

The science behind each active ingredient, independent of which brand sells it.

Ashwagandha

The best-studied adaptogen for stress and sleep.

2 landmark RCTs · US: Dietary supplement · EU: Food supplement (novel status in some countries)
Question 2

Is this bottle good?

The specific product: dose, price, transparency, and what buyers report.

Dose vs research
100% of trial dose
Meets or exceeds the published effective dose
Cost at trial dose
$0.48/day at trial dose
What one effective daily dose actually costs
Transparency
6.0/10 · No public lab certificate
No third-party testing disclosed
Consumer signals
4,266 reviews across platforms · n/a · high confidence
Operational signal only, never used as clinical evidence
Question 3

What's the catch?

Safety flags, transparency gaps, dosing concerns, and recurring buyer complaints.

!
Review advised
ashwagandha: thyroid medication interaction
Safety signals
Drug interaction risk — ashwagandha
May potentiate thyroid hormone replacement (levothyroxine), raising risk of hyperthyroid symptoms; caution advised with sedatives, immunosuppressants, and blood sugar/blood pressure medications due to additive effects. Avoid in patients with cirrhosis or advanced chronic liver disease.
Read more
Safety flag
ashwagandha: thyroid medication interaction
Dose or interaction risk detected. See ingredient page for details.
No public lab certificate
Certificate of Analysis not published
Without a public lab certificate, batch purity and potency cannot be independently verified.
No third-party testing
Independent lab verification not disclosed
The brand does not publish evidence of independent batch testing.
Buyer complaints
Amazon: Effects vary by individual; iHerb: Occasional mild stomach upset reported
Recurring themes from consumer review platforms.
Plain English

What’s inside

The main ingredients of this product, in plain language.

Ashwagandha300 mgEvidence B

The best-studied adaptogen for stress and sleep.

Read about Ashwagandha →
Layer 3 · Evidence vault

Product data & verification

Hard numbers and independently checked status. Expand each block for its source.

The numbers

Price
$29
per bottle · 120 servings
Dose vs. research
of trial dose 100%
of published effective dose
$ / day at studied dose
$0.48
what one effective daily dose costs
$ / g active
$0.80
per gram of active substance
Independently checked

Data verification

COA status
Not public
Evidence grade
B
Per-ingredient breakdown
BAshwagandha

All product data is checked against original sources. Prices, doses, and testing status are updated when product pages change. Evidence grades are reviewed when new human RCTs are published. Read how we verify.

What's inside

Ingredient
Dose in this product
Trial dose
Evidence
300 mg 50% of trial dose
600 mg
3.2 /5
High confidence
4,272 reviews across 4 platforms (4 sources)
Source diversity: 92%
AmazonTrustpilotYouTubeiHerb
PraiseHelps relaxation and stress reliefGood value for money
ComplaintsEffects vary by individualOccasional mild stomach upset reported
Last checked: 2026-08-20

Consumer signals

Consumer signals gathered from 4 platforms.

High confidence

Consumer sentiment compiled from 3 public sources.

Amazon

4,266 reviews · positive sentiment

PraiseHelps relaxation and stress reliefGood value for money
ComplaintsEffects vary by individual
Themes

Jarrow's KSM-66 Ashwagandha has over 4,200 Amazon reviews, with buyers citing reduced stress/anxiety and better relaxation.

Compiled from Amazon listing located during research; verified at build time.

iHerb

positive sentiment

PraiseGreat value for qualityPleasant smell, effective adaptogen
ComplaintsOccasional mild stomach upset reported
Themes

iHerb reviewers report noticeable mood and stress benefits, calling it a great value adaptogen.

Compiled from iHerb listing located during research; verified at build time.

YouTube

positive sentiment

PraiseBacked by clinical KSM-66 extract research
ComplaintsCost adds up at higher doses
Themes

Independent reviewers score Jarrow's KSM-66 Ashwagandha 8.3/10, citing clinically studied extract quality.

Compiled from YouTube listing located during research; verified at build time.

Trustpilot

6 reviews · 3.0/5

These are consumer sentiment signals. They do not measure whether the product actually works. See our evidence section for that.

What others say (unverified)

No external reviews aggregated yet for this product.

Layer 3 · Evidence vault

Evidence, claims & regulation

Published evidence, claim checks, regulatory status and what could not be verified.

Evidence

Research behind this product

The studies that established the trial dose and evidence grade for each active ingredient in this product. Click through to read the original paper.

AshwagandhaChandrasekhar et al. 2012
AshwagandhaGopukumar et al. 2021 (cognition in stressed adults)
Important to know
AshwagandhaNot for pregnancy, hyperthyroidism, or with sedatives. Effects on TSH can complicate thyroid conditions.

Editorial notes

Standard-dose (300mg) KSM-66 ashwagandha in a 120-capsule bottle, a 4-month supply at 1 cap/day, competitively priced versus other KSM-66-branded single-ingredient products on the market.

Go deeper

Where this sits

Actives inside
Ashwagandha
Category
See all in Adaptogen →
Brand
Jarrow Formulas profile →
Add to compare Visit brand site →
Brand owners

Spot an error?

If you are the manufacturer or brand owner of Jarrow Formulas Ashwagandha (KSM-66), 300 mg and believe any data on this page is incorrect (wrong dose, wrong ingredient, wrong price, missing certification, outdated status), you can request a correction.

We review every request, verify it against primary sources, and publish any accepted change with a dated note. Corrections from brand owners are treated the same as corrections from anyone else: verified before they move.

Request a correction →
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