Fund manager Schroders is offering charity clients new "absolute return" products which aim to ensure positive returns.
The funds are similar to hedge funds but do not "short sell", meaning the fund will not sell shares which it does not own to buy them later at a lower price.
They are also more tightly regulated than hedge funds and are more tax efficient.
But unlike conventional equity funds, the manager of an absolute return fund can preserve capital by holding cash, or changing asset allocation very rapidly.
Schroders believes that in the current investment environment, world markets may not rise significantly. In such circumstances, it argues the benchmark approach to investment is no longer viable.
Rupert Robinson, managing director of Schroders Private Bank, said: "Our clients are looking for an absolute return within a familiar structure."