Buy pyrilutamide in the UK.
Pyrilutamide (research code KX-826) is a modern selective androgen receptor antagonist. It is the only topical antiandrogen in the RU58841/KX-826 category to reach Phase 3 human clinical trials. Norwood Labs sells it independently assayed, batch-by-batch, with the Certificate of Analysis published on the product page before you buy.
Pyrilutamide (KX-826), three ways.
What actually matters when buying pyrilutamide.
Pyrilutamide is the newer sibling of RU58841 and considerably more expensive: the raw material is harder to source and the compound is roughly 10x more potent per molecule, so it is supplied at 0.5% rather than 5%. Fair UK pricing sits at around £35-60 per 30 ml of 0.5% solution and £120-200 per gram of powder. Below that range, the concentration is probably not what the label says.
The other thing that matters: independent testing. Pyrilutamide is expensive enough that under-labelling is a real risk in the market. Norwood Labs assays every batch quantitatively (mg/mL, not just % purity) and publishes the result on the product page.
Pyrilutamide (KX-826) is sold strictly as a research reference material for laboratory research use. It is not a licensed medicine and no medical or treatment claims are made.