I understand that it helps because it has a lot of vitamin C in it.
This is what I have found out:
This site also has a recipe for making it.
Quote:
pregnant women must NOT use this as pine needles will cause "abortion" this also happens in cows, when they eat the pine needles they will drop their calf's (dead) within a couple of days if not hours.
http://www.thealapahariverbandofcherokeeinc.com/herbs.htm
http://www.buzzle.com/articles/pine-needle-tea.html
The following is a generic article by Susun Weed. She doesn't mention any side effects that I could find.
http://www.susunweed.com/herbal_ezine/Weed_letter_Dec-01.htm#article
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Seems that there's some strong anecdotal evidence that pregnant and nursing mothers should probably steer clear of it, as well as anyone who might be pregnant at any point
http://homesteadingthebackforty.blogspot.com/2008/11/foraging-pine-needle-tea.html
Quote:
Herbs that may be harmful to mom and/or baby
Other herbs should be avoided while nursing due to their potential for harming mom and/or baby. Here are a few herbs that are generally considered to be contraindicated for nursing mothers. This is by no means a complete list.
* Bladderwrack
* Buckthorn
* Chaparral
* Coltsfoot (Farfarae folium)
* Dong Quai (Angelica Root)
* Elecampane
* Ephedra / Ephedra sinica / Ma Huang
* Ginseng (Panax ginseng)
* Indian Snakeroot
* Kava-kava (piper methysticum)
* Petasites root
* Phen-fen, herbal
* Rhubarb
* Star anise
* Tiratricol (TRIAC)
* Uva Ursi
* Wormwood
http://www.kellymom.com/herbal/herbs_to_avoid.html
These sites didn't mention pine needles as contraindicated.
http://www.gaianaturopathic.com/docs/Herbs_contraindicated_pregnancy.pdf
http://www.earthmothermoonchild.com/herbsnotforbf.html
Basically, I only found one source that said it shouldn't be used while nursing (see above) but it never gave any reasons. If it makes you too concerned, you could use something else high in vitamin C.
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