Contact

Get in touch with our customer service team.

We aim to respond to all customer enquiries within one working day. For order-related questions, please include your order number where possible — it helps us help you faster.

Customer service

Email us at customer@one-self.nl for order tracking, returns, payment questions, or anything else related to your purchase.

Email: customer@one-self.nl
Response time: Within 1 working day (Monday–Friday)
Scope: Order tracking, returns, payment questions, and anything else related to your purchase.

Medical questions

Please note: we cannot provide medical advice, interpret your test results, or replace consultation with a healthcare professional.

If you've received a reactive (preliminary positive) result, please contact your doctor or local sexual health clinic for confirmatory testing. Each INSTI kit includes a resources card with guidance on what to do next.

Company details

One Self B.V.
Veldweg 15, 8196 KS Welsum, the Netherlands
KvK: 67518087
VAT: NL857044837B01

Note: this is our registered address. We do not accept walk-in visits or returns at this address — please contact us by email first for return instructions.