Neither one sounds OK to me. You need both, plus an medication that is the alternative. Because of its anti-inflammatory properties, red ginseng can be a great natural alternative to ibuprofen in reducing the severity of rheumatoid arthritis.
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Aspara GusTo is not the best choice here. Usually, with the word alternative, to is used when two possibilities are stated, e.g., an alternative to buying is renting. Your sentence, on the other hand, states one possibility, and can momentarily suggest that red ginseng can be chosen instead of reducing the severity of the disease. In this case, I think that in and for are
AnonymousThank you and you mean that "Red ginseng can be a great natural alternative to reducing..." means "red ginseng can be chosen instead of reducing the severity of the disease." But that doesn't make sense. That's why "in" or "for" is more proper? Am I right?That's right. I recommend for, as used in my first example.