I'm assuming you mean marrow from bones and not vegetable marrows.
The short answer would be yes, in moderation, and from compliant meat sources. If it is not listed, it is a neutral. I wouldn't go heavy on marrow, since there is fat there. But marrow bones from healthy, grass-fed beef or naturally raised lambs are delicious in soups.
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ask away if you need help
and thanks to Joe for looking that one up!
Who would have known bone marrow was not the issue here!
''Just follow the book, don't look for magic fixes to get you off the hook. Do the work.'' Dr.D.'98 DNA mt/Haplo H; Y-chrom/J2(M172);ESTJ The harder you are on yourself, the easier life will be on you!