About VitaminDB

The problem

Generic deal sites tell you what’s on sale. They don’t tell you that the magnesium oxide you just bought is half as bioavailable as glycinate, or that the “1000 IU vitamin D” deal works out to 5× the cost-per-dose of an equivalent product two clicks away.

What we do differently

• Real cost-per-dose. Every deal is normalized by serving size and daily dose. Sort by what you actually pay per day, not the sticker price on the bottle.
• Form transparency. Magnesium glycinate, citrate, malate are different molecules with different evidence behind them. We tag them separately.
• 3rd-party testing flags. Brands that publish certificates of analysis, run NSF/USP/Informed Sport audits — surfaced first.
• Community temperature. Each deal voted hot or cold by people who actually buy. No marketing fluff, no SEO spam.

How we make money

When you click “Get deal” we redirect you through an affiliate program (Amazon Associates, iHerb Rewards, Awin partners). The commission is paid by the merchant — you don’t pay more. If a deal has no affiliate program, the link still works, we just earn nothing.

We never accept payment to promote a deal. Sponsored placements, if introduced, will be labeled sponsored in the URL and the badge.

For the live numbers — earnings, traffic, takedown counts — see our transparency report. For how cost-per-dose and lab data are sourced, see methodology.