Updated: June 2026
100ml or 500ml?
We offer two main sizes: 100ml dropper and spray bottles, and a 500ml refill. The 100ml sizes are handy to keep to hand; the 500ml refill is better value for regular use and tops the smaller bottles up. Sold for external use only.
This guide covers colloidal silver 100ml vs 500ml: which size to buy, whether the 500ml refill is better value, and how long a bottle really lasts.
Size is the last of the three choices — after strength and format — and it is the easiest.
Here is how to pick. For the wider picture, see our complete colloidal silver guide.
UK-made colloidal silver, in dark glass
Double-purified water — reverse osmosis, then distilled — with real silver. Made in the UK.
What size colloidal silver should I buy?
It depends on how often you use it — a 100ml to try it or keep one handy, the 500ml refill for regular use.
If you are new to it, a 100ml is the natural place to start. If you reach for it often, the refill saves you reordering.
What’s the difference between 100ml and 500ml?
Size and purpose — not the silver itself, which is identical.
- 100ml — our dropper and spray sizes, easy to keep to hand or carry.
- 500ml — our refill, a larger bottle for topping the smaller ones up.
Is the 500ml refill better value?
Yes — the larger refill works out cheaper per millilitre and cuts down on packaging.
That is why regular users tend to choose it: keep your dropper or spray, and top it up from the refill.
How long does a bottle of colloidal silver last?
Stored well — cool, dark and tightly closed in its dark glass — it keeps for a long time.
Light, heat and contamination are what shorten it, so a closed cupboard is the best home. Our how to store colloidal silver guide covers it.
Which size is best for travel?
The 100ml is the one to take with you — small enough for a bag.
Keep the 500ml refill at home and top up your travel bottle before you go. Either way, it is sold for external use only.
You can compare every size in the shop, or build a mixed pack and save with our bundles.
Buy more, save more
Build your own pack and save up to 15%, or pick a ready-made bundle.
Secure checkout · Made in the UK
Why buy from Health is a Choice
We make our colloidal silver in the UK, the way we would want it for our own family. We don’t purify our water once — we do it twice.
It is first cleaned by reverse osmosis, then distilled on top of that, before we suspend real silver in it and bottle it in dark glass — never plastic.
- Made and bottled in the UK
- Bottled in dark glass, never plastic
- Double-purified water: reverse osmosis, then distilled
- Available in 10, 100 and 200 ppm
- 100ml dropper, 100ml spray and 500ml refill
- Free Royal Mail Tracked 48 on every order
Related guides
- Colloidal silver: the complete UK guide
- Dropper, spray or refill: choosing your format
- How to store colloidal silver: keep it at its best
- Colloidal silver: your questions answered
Made in the UK · Dark glass, never plastic · Free Royal Mail Tracked 48
Last updated: June 2026
This article is for general information only and is not medical advice. We make no medical claims. If you have a health concern, please speak to your GP or pharmacist.
