This is from their FAQ:
I am allergic to lanolin/wool, can I use Lansinoh HPA Lanolin? How is that possible?
That is a logical question as there is some confusion about this issue.
What is often considered an allergy to wool is actually a contact dermatitis that results from irritation from the wool fiber itself or dyes in the wool as they interact with the skin. Lanolin, on the other hand, is a by-product of wool washing ? the wool is washed and the raw wool grease undergoes a series of refinements that results in our ultra pure lanolin, which is an entirely different material than wool.
Lansinoh HPA® Lanolin for Breastfeeding Mothers was developed especially for breastfeeding mothers, and is refined by a patented process to remove impurities. There are many refinements of lanolin in the market and only Lansinoh has been proved to be completely safe for use by mother and baby. It is the only lanolin available that has had environmental impurities (including pesticide residues) and allergenic components (including detergent residues) filtered to an extremely low level or removed.
Additionally, Lansinoh HPA® Lanolin does not contain preservatives or additives of any kind (including BHT). People, who consider themselves allergic to wool and may have avoided Lanolin in the past, will be happy to know that they can use Lansinoh with confidence.
In the over 25 years that Lansinoh has been available, the company is not aware of a single documented case of an allergic reaction to Lansinoh Lanolin. However, that does not mean that someone somewhere could have a possible reaction. We would suggest that you apply Lansinoh on the inside of your forearm and cover it with a band-aid for 24 hours. After that time, check and see if there is any redness or itching. Obviously, if you have an unpleasant reaction before the 24 hours, discontinue any use of Lansinoh immediately.