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Asthma-friendly products: Do they really help?

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If you have asthma, your doctor may suggest that you take steps to control asthma triggers in your home. Asthma-friendly products may seem like a good step, but you may be wondering whether they really work and if they're worth the cost.

Many manufacturers claim that their products reduce asthma triggers. There's more evidence for some products than for others. Here are some tips to keep in mind before spending your money.