It said it was too difficult to assess the risks and returns of investments, and suggested applying “mortgage-lending standards” to loan-based platforms.
It follows industry regulations in 2014 that some providers called restrictive.
But the BBC reports that the FCA says it wants protections that are “appropriate for the risks”.
Crowdfunding taps into ordinary consumers who want to buy equity, or a stake, in a new start-up, or lend it money.
Many are hosted through website platforms such as Kickstarter, Indiegogo or Rockethub.
But while some crowdfunded businesses succeed, about one in five fail, according to data compiled in 2015 by AltFi Data and law firm Nabarro, leaving investors out of pocket.
‘Not always fair’
Following a recent review of the market the FCA said it had found a number of weak spots in the market.
It said that it was difficult for investors to compare crowdfunding sites with each other – or with other asset classes – due to “complex and often unclear product offerings”.
It also found that financial promotions were not always “clear, fair and not misleading”, and that the complex structure of some investments created “operational risks that are not being managed sufficiently”.
And on loan-based platforms specifically, it said that stronger rules were needed in the event a crowdfunded business failed.
FCA chief executive Andrew Bailey said the watchdog would consult on tougher rules around the disclosure of information next year.
“Our focus is ensuring that investor protections are appropriate for the risks in the crowdfunding sector while continuing to promote effective competition in the interest of consumers.
“We plan to consult next year on new rules to address the issues we have identified.”