Label snapshot
What the product contains and what one serving costs, according to our catalog. Label amounts are not personal dose recommendations.
| Ingredient | Amount per serving |
|---|---|
| Vitamin C | 10 mg |
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.
These calculations describe our scoring method. They are not a recommended dose or proof of benefit from this product.
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.
This Life Extension Super K scores 5.8, making it below the site average. It delivers 10mg of Vitamin C, 5% of the studied range low edge (200mg) with grade A evidence (strong human trial data). At $16.67/day it's among the more expensive options in Vitamin.
The science behind each active ingredient, independent of which brand sells it.
Correcting deficiency is important; megadoses rarely add benefit.
The specific product: dose, price, transparency, and what buyers report.
Safety flags, transparency gaps, dosing concerns, and recurring buyer complaints.
The main ingredients of this product, in plain language.
Correcting deficiency is important; megadoses rarely add benefit.
Read about Vitamin C →Hard numbers and independently checked status. Expand each block for its source.
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.
Consumer signals gathered from 4 platforms.
High confidenceConsumer sentiment compiled from 3 public sources.
mixed sentiment
Amazon reviewers report using Super K for arterial and bone health, though effects aren't always immediately noticeable.
Compiled from Amazon listing located during research; verified at build time.
positive sentiment
iHerb reviewers highlight the high menaquinone content as a differentiator, with some noticing effects within days.
Compiled from iHerb listing located during research; verified at build time.
831 reviews · positive sentiment
An independent review index tracks 831 total reviews for Life Extension's Super K with an 8.4/10 score, with about 221 recent verified reviews trending +80% positive.
Compiled from Amazon (ReviewIndex aggregation) listing located during research; verified at build time.
719 reviews · 4.3/5
These are consumer sentiment signals. They do not measure whether the product actually works. See our evidence section for that.
No external reviews aggregated yet for this product.
Published evidence, claim checks, regulatory status and what could not be verified.
The studies that established the trial dose and evidence grade for each active ingredient in this product. Click through to read the original paper.
A tri-form vitamin K product (K1 + MK-4 + branded MenaQ7 MK-7), more complete than most single-form K2 products on the market, aimed at arterial calcification / bone health rather than a specific longevity mechanism, but relevant to the vascular-health side of healthy aging.
If you are the manufacturer or brand owner of Super K 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 →The next highest-scoring products in Vitamin, same scoring method, same rules.
Nordic NaturalsStatus as recorded in the catalog from brand materials; not independently verified by NO1GEVITY.
Editorial score, not proof that this product works. Research-dose calculations are not dosing advice.
DoNotAgeStatus as recorded in the catalog from brand materials; not independently verified by NO1GEVITY.
Editorial score, not proof that this product works. Research-dose calculations are not dosing advice.
Nordic NaturalsStatus as recorded in the catalog from brand materials; not independently verified by NO1GEVITY.
Editorial score, not proof that this product works. Research-dose calculations are not dosing advice.
Status as recorded in the catalog from brand materials; not independently verified by NO1GEVITY.
Editorial score, not proof that this product works. Research-dose calculations are not dosing advice.
Undisclosed amounts noted
Status as recorded in the catalog from brand materials; not independently verified by NO1GEVITY.
Editorial score, not proof that this product works. Research-dose calculations are not dosing advice.
Life ExtensionStatus as recorded in the catalog from brand materials; not independently verified by NO1GEVITY.
Editorial score, not proof that this product works. Research-dose calculations are not dosing advice.
Life ExtensionMulti-ingredient bundle
Status as recorded in the catalog from brand materials; not independently verified by NO1GEVITY.
Editorial score, not proof that this product works. Research-dose calculations are not dosing advice.
Life ExtensionStatus as recorded in the catalog from brand materials; not independently verified by NO1GEVITY.
Editorial score, not proof that this product works. Research-dose calculations are not dosing advice.