Victoria's biggest alcohol and drug service provider is calling on MPs to pledge extra money to help the state's troubled youth.

Victorians as young as 12 who are at risk of becoming dependent on alcohol or drugs are the focus of a major new push for extra health funds.

The Youth Support and Advocacy Service is launching a 10 point plan urging all MPs to get behind the initiative to boost funding by $24.5 million in the lead up to November's state election.

Under the plan, the state's biggest youth alcohol and drug service provider would use the cash for various treatment measures including 30-new rehabilitation beds.

YSAS chief executive Andrew Bruun says the service is "overwhelmed" by demand and has been funding its initiatives through government and donor support and fundraising.

"We know that the teenage years are the key period for the emergence of substance abuse disorders," Mr Bruun said.

"With targeted investment - focused on the youngest and most vulnerable Victorians - there is so much more that can be done."

While the state government has given $184 million through the Ice Action Plan and another $87 million in a plan for drug rehabilitation, Mr Bruun said none went to services for youth aged 12 to 18.

"We know that substance misuse leads to poor health outcomes, increased crime and community concern," Mr Bruun said.

"It makes sense to nip substance use problems in the bud by intervening early with effective programs for young people an families. We will all reap the long-term benefits if we do."

He said if problems with younger people weren't dealt with, there's a high risk they'll have "extremely poor health and social outcomes by the time they're young adults".

The plan will be launched at a breakfast event at the Melbourne Exhibition Centre.