Buying guide
Where to Buy NSI-189
Compare NSI-189 phosphate capsules with phosphate and free-base powders. Check the exact form, batch documentation and shipping limits before choosing a supplier.
Compare NSI-189 Offers
“Vetted” here means a review of public product information and linked documentation, with gaps explained below. We have not bought or independently tested these products. Listing a supplier is not a certification of purity, safety or medical suitability.
NextChems
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10% off — auto-applied at checkout
- Buy NSI-189 · 10% offNSI-189· Phosphate capsules · 20 mg × 60
An 8-week protocol at 60 mg twice daily ≈ 6 bottles
Swiss Chems
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10% off — auto-applied at checkout
- Buy NSI-189 · 10% offNSI-189· Phosphate capsules · 20 mg × 60
An 8-week protocol at 60 mg twice daily ≈ 6 bottles
- Buy NSI-189 · 10% offNSI-189· Phosphate powder · 1 g
- Buy NSI-189 · 10% offNSI-189· Free-base powder · 1 g
Choosing a NSI-189 source
Phosphate capsules, phosphate powder or free base?#
Match the form to your laboratory's specification before comparing suppliers. The listings below describe three formats; “NSI-189” alone does not identify which one you are ordering. Pack quantities are vendor labels, not independently measured contents or instructions for human use.
| Listed form | Pack label | What to check before ordering |
|---|---|---|
| NextChems phosphate capsules | 20 mg × 60 capsules | Request a finished-product report and clarification of the identity information noted below. |
| Swiss Chems phosphate capsules | 20 mg × 60 capsules | Confirm the report covers capsules and the batch being supplied, not only raw powder. |
| Swiss Chems phosphate powder | 1 g | Confirm the phosphate form and ask for a batch-specific identity/purity report. |
| Swiss Chems free-base powder | 1 g | This is a different chemical form from phosphate. Match the form to the research protocol. |
Capsules offer a labelled amount per unit; bulk powder offers a labelled total quantity. Those packaging differences do not establish comparative purity, effectiveness or suitability for a particular experiment. Do not assume equal labelled masses of phosphate and free base are interchangeable. PubChem records NSI-189 phosphate separately.
A product-identity discrepancy to resolve#
The NextChems listing was titled NSI-189 phosphate, but its formula and CAS information did not agree with the Swiss Chems phosphate listing or the linked PubChem record when checked. This is a discrepancy in published information, not proof about the contents of a shipped product. Ask NextChems to confirm the chemical identity and provide the relevant batch document before relying on that listing for a specified research form.
Swiss Chems lists both phosphate and free-base powder. Its wider selection is useful when a protocol calls for a particular form, but having more formats is not evidence of better product quality. NextChems provides a capsule listing; that is not an independently verified equivalence to Swiss Chems capsules.
Testing documents: what we could verify#
Both vendors advertise third-party testing. Swiss Chems provides a searchable test-results directory. We could open it, but did not verify a report matching any of these NSI-189 offers to the batch a customer would receive. NextChems' linked COA directory also opened, but its returned report list did not identify NSI-189. We did not verify a matching batch document. A product page's testing claim is not a substitute for reviewing the document.
Before choosing a supplier, request the product name and chemical form, batch identifier, test date, laboratory name, methods and results. For capsules, establish whether the report concerns the finished capsule or its raw ingredient. A document for a different form or batch does not verify the offer you intend to order. We have not independently authenticated these batches or tested purity, contaminants or capsule contents.
Shipping and total cost#
Swiss Chems' shipping policy distinguishes US domestic and international delivery; FedEx express options are limited to eligible US addresses. NextChems' policy says some destinations are excluded and product-specific restrictions can apply. Neither policy establishes that this compound can be imported into every country. Both put import fees on the recipient and state that seized parcels are not eligible for a refund or reshipment.
Confirm destination eligibility with the supplier before ordering. Compare the same chemical form and labelled pack quantity, then check shipping, duties and the coupon's actual effect in the cart. We do not verify live stock, promise delivery dates or maintain live prices. The existing offer buttons preserve our referral and coupon information.
Research claims are not a buying guarantee#
NSI-189 phosphate has been studied clinically, but a 220-participant phase 2 depression trial did not show a statistically significant benefit on its primary depression measure; some secondary measures favored treatment. That does not establish that retail research products improve mood or cognition, nor does it validate these suppliers' products. These listings are for laboratory research, not human consumption. See the NSI-189 profile for broader research context.