Quick answer: genuine filler should pass 5 checks
If you have only a few minutes before treatment, check these first: the box is sealed, the label clearly identifies the product, the lot number and expiry date match the syringe inside, the box is opened in front of you, and the brand or product line matches what you agreed to pay for. Filler injection is a medical procedure, so you have every right to ask for evidence before the needle touches your face.
The genuine-filler checklist before injection
- The box is intact and the seal unbroken — you may ask to hold it
- It carries a Thai-language label and a Thai FDA registration number — legally imported product must have one
- The lot number and expiry date on the box match the syringe inside
- A new box is opened in front of you, always — that is the standard at a good clinic, not a special request
- The brand and product name match what was agreed and what you are paying for
- The receipt or treatment record states the procedure, brand and amount used, not only a vague "filler" line item
If any one of these fails, you have every right to stop and ask immediately — before the injection, not after.
How to ask the clinic without feeling awkward
A good clinic is used to this question. You can simply say: "Could I see the box, lot number and expiry date before it is opened? I want to make sure it matches the product I booked." You can also ask: "After treatment, may I take a photo of the box and lot number for my record?" If the clinic opens the box clearly and explains why that filler is suitable for the area, that is a good sign. If staff avoid the question, say it is unnecessary, or rush to inject without showing anything, step back.
What split-vial filler is, and why it is dangerous
Split-vial filler means one syringe divided across several customers, or decanted into other containers to sell more cheaply. The problem: a sterile product is only sterile until it is opened. Splitting risks contamination and infection, the lot number can no longer prove whether the product is real, and the amount you receive often isn't what you paid for. The cheaper price buys the most expensive risk there is.
Is grey-market filler different from fake filler?
Grey-market filler may look like a genuine overseas product, but that does not mean it was legally imported into Thailand or stored according to the manufacturer's conditions. As a patient, you cannot verify the import route, temperature control or local accountability in the same way as a product distributed through the legal Thai channel. Fake filler imitates a brand or contains a substance that does not match the label. Both create the same core problem: poor traceability, and much harder treatment if something goes wrong.
Fake filler is more dangerous than you think
The fakes in circulation are often not real hyaluronic acid at all. In some cases they are substances that cannot be dissolved with the enzyme. When problems strike — lumps, chronic inflammation, a blocked blood vessel — fixing it is many times harder than with genuine filler, because the doctor doesn't even know what substance they are dealing with. This is why an abnormally cheap price is not a promotion — it's a warning sign.
Check the Thai FDA database yourself
Legally imported medical devices and medicines should be checkable through the Thai FDA's product-search system. Before searching, ask the clinic for the product name, product line and registration details. If the clinic refuses to give any information, treat that as a warning sign. Suspicious products can be reported to the FDA hotline 1556.
Symptoms after filler that need urgent care
Mild swelling and bruising can happen after filler. But severe pain, pale or white skin, grey or dark patchy skin, sudden vision changes, facial weakness, slurred speech or an unusually severe headache should be assessed immediately. The US FDA identifies accidental injection into a blood vessel as a serious filler risk that can lead to tissue death, vision problems, blindness or stroke. Do not wait at home if these signs appear.
If you suspect you've already received a fake
Keep all the evidence — the box, photos, receipts, the chat where things were agreed — and see a dermatologist or a doctor experienced with filler immediately for assessment. Don't wait and watch on your own. Then report to the FDA at 1556, and if the clinic's behaviour looks illegal, report to the HSS at 1426 as well. For the detailed clinic-and-doctor check, read our step-by-step license guide.
The bottom line
Genuine filler can always prove itself — a real box, a Thai FDA label, matching lot numbers, opened in front of you. Anything you are asked to accept purely on trust, with no way to verify it, does not belong in your face.