Lanolin is wax from sheep skin glands. Commonly found in skincare products for babies.
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Lanolin is safe to ingest (it is found on fleece) it is used for cracked nipples in breastfeeding and is one of few (in fact the only one "I" know of) ointments you do not wipe off before feeding the babe.
Do not have any vit D suggestion but I recommend rubbing the cold sore with alcohol - the stronger the better - a few times a day for a few days and it will scab over and go away without being to much nuisance. I used to get them all the time and tried many things but alcohol works best for me.
If you are allergic to wool, do NOT use anything with lanolin in it. It does really bad things to your nipples when you use it while breastfeeding if you are allergic.
Yes gelcaps is the way to go, tablets do not work per Dr William Davis.
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His evidence is from what he sees in his practice. He doesn't really give any scientific backing of cite any studies. He mentions that he has had some patients have success when taking tablets with some oil. So the gelcaps may not be totally necessary unless you're taking your D while fasted.
I prefer the Carlson drops mostly because there are no other ingredients other than the coconut oil (and the D of course). Any gelcap or tablet will have some other ingredients which may or may not be benign.
My wife had a Vit D level of 7 (normal range 30-80 or so). They put her on 50,000IU of D2 taken twice a week for 12 weeks. At the end, her Vit D level was 70. That was all with Vit D2, she is now on 10,000IU D3 daily.
It's really strange, though, the only thing you can get a prescription for is D2. But everything you read says D3 is the way to go.