Even if you buy through a bank and the fund carries the bank's name, there is no guarantee. You can lose money. Mutual funds always carry investment risks.
Some types carry more risk than others.
Understand that a higher rate of return typically involves a higher risk of loss. Also, a fund's track record is not a reliable indicator of future performance. Beware of dazzling performance claims. All mutual funds have costs that reduce your investment returns. You can buy some mutual funds by contacting them directly.