Introductory Offer for New Customers You Do Bio offers all laboratories and companies* that want to test GeneFix Saliva Collectors Two Free saliva collectors. Request Your Free Sample Here to go to request your free samples. *Offer limited to Denmark only. One time offer per entity. You must be a company, public or academic research laboratory with a genuine need to collect high quality DNA from saliva. We do not supply this product to private individuals, e.g. for ancestry or paternity testing.