CZTL Review: Methylene Blue Powder
This CZTL review covers a store that sells methylene blue powder in sizes from 1 g to 50 g and ships to several countries.
Before you buy: the FDA has not approved methylene blue powders sold online. It can interact with some antidepressants, so check with a doctor first. Our links are affiliate links.
Products
Ultra High Purity Methylene Blue Powder
From $30.00 per 1 g
- 1 g $30, 5 g $70, 10 g $120, 20 g $230
- Says >99.99% purity, verified by a US ISO/IEC 17025 accredited lab
- All sizes showed as sold out when we checked, so confirm stock
USP Methylene Blue Powder, 50 g
$500.00
- Listed as USP grade
- Shows as sold out at the time we checked
At a glance
| Feature | Detail |
|---|---|
| Format | Powder only |
| Testing | States a US ISO 17025 lab verifies purity. No Certificate of Analysis is linked on the page we read |
| Ships to | US, UK, Canada, Australia and the EU |
| Payment | Major cards, Apple Pay, Google Pay and PayPal |
| Address | Not stated on the pages we read |
| Intended use | Not stated |
What to check first
- Ask for the Certificate of Analysis for your batch, because none is linked.
- Powder is easy to measure wrongly and stains heavily. We do not give preparation or dosing advice.
- Stock changes often, so check availability and the live price.
Prices last checked in October 2026.
CZTL Review: What We Found
This CZTL review looks at an online store that sells methylene blue as a powder only, in sizes from 1 g to 50 g. Prices run from $30 for 1 g to $500 for a 50 g USP listing, and the store says it ships to the US, UK, Canada, Australia and the EU.
What stands out in our CZTL review
- The store claims more than 99.99% purity, verified by a US lab accredited to ISO/IEC 17025.
- It offers a range of sizes, which suits people who want a small first order.
- It accepts major cards, Apple Pay, Google Pay and PayPal.
What we could not confirm
- No Certificate of Analysis was linked on the page we read.
- Every size showed as sold out when we checked, so confirm stock first.
- No company address or intended-use statement was shown.
- Two sizes were listed twice at different prices, with no explanation.
Handling powder safely
Powder is easy to measure wrongly, and methylene blue stains heavily. We do not give preparation or dosing advice. Methylene blue can also interact with some antidepressants, so talk to a doctor or pharmacist first.
Prices by size
The powder cost $30 for 1 g, $70 for 5 g, $120 for 10 g and $230 for 20 g, with a 50 g USP listing at $500. The larger sizes cost less per gram, but powder only suits you if you are set up to handle it safely. Check the stock and the live price on the store before you plan an order.
Shipping and payment
The store says it offers local shipping in the US, Australia, the UK, Canada and the EU, and that it ships globally. It does not state a shipping cost on the pages we read, so check it at checkout. Payment options include major cards, Apple Pay, Google Pay and PayPal.
Questions to ask CZTL
- Can I see the Certificate of Analysis for the batch I will receive?
- Which sizes are in stock, and when will the rest return?
- Is this product intended for research or for people?
- Where is the company based, and how do I contact it?
Compare it with other stores in our methylene blue suppliers guide, or look at how we compare ivermectin suppliers. Prices were checked in October 2026 and can change. We update this CZTL review when the store restocks or changes its prices.