Seventy-six thousand leaflets promoting the Fundraising Preference Service are due to arrive in doctors’ surgeries in England, Wales and Northern Ireland today.
The Fundraising Regulator, which operates the FPS, has sent the leaflets to increase awareness of the service among older people.
A spokesman for the regulator said the leaflets cost £5,500 to design and print and £12,000 to distribute, which means each leaflet cost about 23p.
The leaflet contains information about how the FPS works as well as details about the regulator.
It says 5,000 people have so far used the free service to prevent one or more charities from getting in touch with them by phone, mail, email or text.
The spokesman for the regulator said that no further promotional activity for the FPS had been planned.
Third Sector revealed last month that the service received only 16,557 requests to block charity communications in its first nine months, with more than 6,000 of those coming in the first four weeks.
Stephen Dunmore, chief executive of the regulator, said: "This is a really important initiative to make sure that those who need our service have all the tools in place to manage communications from charities."
The leaflets are due to remain in surgeries until September.
The regulator has also updated its Code of Fundraising Practice to incorporate the General Data Protection Regulation’s changes to UK law.
The revised code, which came into effect at the end of last week, is based on guidance from the Information Commissioner's Office and includes new sections on direct marketing and data protection.
It includes expanded definitions for "processing", "consent" and "legitimate interest".
Gerald Oppenheim, head of policy and communications at the regulator, said: "Implemented correctly, the GDPR is an opportunity for charities to understand how important the correct use of data is for their fundraising. This is essential for maintaining public trust and confidence."