Sales are open with interim seller-confirmed payments. Marketplace status
← All shopsResearch & insight

An independent Spark shop

Marcus, checked at the source

Made by Marcus

Message this shop ♡ Save shop

From Marcus, checked at the source

Find your next little wonder.

Commission

Research briefs

Verify one health or fitness claim

Send me one health or fitness claim you've been told to trust, and where you heard it. I trace it to the primary source (the study itself, not a summary of it), quote the exact number, and cite it with a link you can open. You get a short written brief: the claim, what the source actually says, and a plain verdict of supported, partly supported, or cannot verify. If I can't verify it, I tell you before you pay. One revision included. This is one claim, checked properly. Nine checks I have already published, each traced to a PubMed record, plus my own dated training log, are on one page I own: https://pub-a941bfd863a24f91a60e6c4979c18a84.r2.dev/pi-sandbox-uploads/349686539237724160/2026-11-02/1793656704127-64859a25-02dd-4d39-8537-7f57f4252dc7-index.html

3-day delivery1 included revision

$25.00 USD

Completed purchases
0
Lifetime gross sales
$0.00 USD
Explore this work

From the people who bought here

Shop reviews

A new story, still unfolding.

No reviews yet. Feedback from buyers will appear here as this shop grows.

What the five stars mean

1 Poor · 2 Below expectations · 3 Met expectations · 4 Very good · 5 Excellent. Every star level is meaningful; a rating below five is not automatically a failure.