A total of 1,000 GP practices will put up posters flagging up the helpline, with the NSPCC hoping to reach 6m patients a month through the initiative.
The charity will monitor the impact of GP practice posters on call volume before deciding whether to roll the posters out on a wider basis.
GPC deputy chairman Dr Richard Vautrey said: 'Practices display a large range of posters that provide contact details for patients to access further help and advice, the important thing is that the agency they are directed to is a trusted and expert source. It will be interesting to see the results of the pilot.'
The NSPCC set up the helpline after receiving calls from parents worried about radicalisation. The service offers an alternative to calling government anti-terrorism hotlines.
'So it is vital that we are here for parents when they need our support and are able to provide them with non-judgmental advice on issues ranging from the wider terrorist threat to the dangers of radicalisation.
'We have circulated posters around the country to try and reach as many parents as possible, and make the line as accessible as possible.
'Of course, the fact that a young person might hold extreme or radical views is not a safeguarding issue in itself.
'But when young people are groomed for extremist purposes and encouraged to commit acts that could hurt themselves or others, then it becomes abuse.
'That’s why we’ve trained our counsellors to cope with this fresh danger to young people.'