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Primary Sources Cited Independent health journalism & published-label research
Vitamin D 400 IU Audit Label Reading Guide Serving Cost Calculator
Label Lab

The considered collection

Good choices start with a closer look.

Clear labels. Useful comparisons. A little less guesswork when you browse vitamins and everyday health products.

Explore the guides Compare pack costs

Start with information. Decide at your own pace.

Before you choose

A little reading.
A clearer decision.

These are comparisons of published information. We have not physically tested the products.

Vitamins & supplements

Vitamin D.
Start with the label.

Two 400 IU tablet labels, compared with the sources beside them.

Read the comparison

A practical starting point

Supplement labels, made clearer.

What to look for, what to compare and when to ask for individual advice.

Read the guide How we approach product research

Look beyond the pack price

What does a serving cost?

A larger pack can be harder to compare at a glance. Enter two prices and the serving information shown on each label.

Use the serving stated on each label. This tool compares costs; it does not recommend an intake. Include delivery in the price if you want to compare the total cost.

Pack A

A unit might be a tablet, capsule or gummy.

Pack B

A unit might be a tablet, capsule or gummy.

Calculation: price ÷ complete labelled servings. Partial leftover servings are excluded. Compare strength, ingredients and suitability alongside cost.

The details behind the guide

Know what we looked at.

Our editorial approach

Published labels

We compare the information manufacturers publish, including strength, serving and ingredients.

Sources you can follow

Each guide links to the pages used and shows when they were checked. Labels can change.

Clear commercial links

The Amazon search links in these guides are not affiliate links. We do not currently earn commission from them.

For movement, too

Everyday fitness essentials are taking shape.

Our separate fitness collection is being prepared. The shop is not accepting orders.

Start with a little movement
Interactive Health, Label & Routine Lab · Instant PDF Reports

Four practical tools.
Personalised PDF blueprints.

Inspect your daily supplement stack for overlapping nutrients, decode confusing label units (IU, µg and elemental mineral weights), build a circadian evening wind-down schedule or structure a weekly home mobility plan—then generate a clean, printable A4 PDF report sent to your email and downloaded immediately.

TOOL 01 · CUPBOARD AUDIT & PACK ARITHMETIC

Multi-Supplement Stack, Overlap & Annual Cost Auditor

Many people combine a multivitamin with single supplements (such as Vitamin D, Magnesium or Hair/Skin formulas) without noticing overlapping ingredients or total yearly cost. Enter 2 to 5 packs from your cupboard to audit your daily nutrient totals against Reference Intakes (NRV) and calculate your true annual spend.

Compares declared label quantities & pack arithmetic locally in your browser.

Instant Directory Search

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