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Both IgG and IgM initiates complement. IgG is far more abundant in the body however this does not necessarily means that it initiates complement more. IgM is the 1st immunoglobulin that responds to a foreign antigen as part of the body's hormonal response.

So to answer the question directly, neither immunoglobulin initiate the complement cascade more than the other.

Some research seems to indicated that there is no significant difference in ability to bind complement between IgG and IgM via the classical pathway in humans.

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