Irish scientists have concluded there is no cure for the condition that can make early pregnancy miserable.
Australian experts said the findings came as no surprise, but said remedies could help some women.
The researchers reviewed studies of more than 4000 women who were up to 20 weeks' pregnant.
Some of the so-called remedies actually made the women feel worse. Ginger, for example, gave some of them heartburn.
One treatment - a form of acupuncture called acustimulation, which gives the body tiny electric shocks - appeared to reduce morning sickness in some women after three weeks.
The research, published in the Cochrane Database of Systematic Reviews, concluded that overall, the treatments had little benefit.
Expectant mother Kendall Cordes is 14 weeks' pregnant with her third child and suffers severe morning sickness.
"I've tried everything ... being told ginger will help is like telling someone who's had their leg cut off to take a Panadol and they'll be fine."
The 38-year-old Box Hill woman said she suffered nausea while she was awake and vomited several times a day.
"It's such a battle ... I can't even get up and go to the supermarket because I think I might vomit".
Australian College of Midwives president Associate Prof Hannah Dahlen said morning sickness was a healthy sign of pregnancy.
"Women need to try different things, and sometimes one thing works for one person and not the other," she said.
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