Yes, Wikipedia is usually valid.  Link to it freely, and trust it at least as much as you trust a textbook or a site like Wolfram.  This has been discussed at length here.

If you have time to actually read or glance through what you're linking to (which is ideal), then you can make sure to link to good articles, not just to good sites.  When I link a page, I often use Google to find several pages and then pick the one I find the most relevant or useful in this particular case.  I have found that sometimes the Wikipedia article is best, sometimes the Wolfram article is best, and sometimes some other site is best.

Is wikipedia a valid source to use on MSE?
I bought some juniper extract for making bath stuff, and it doesn't seem to be very effective for this purpose. I have used juniper berries before, so I thought I might be able to use the extract for cooking or baking. I have not been able to find any recipes online. 

Is juniper extract ok to eat? What types of applications would it be good for, I assume whole berries is much better choice for marinades. Would it have the same uses as orange or peppermint extract?
