This is indeed good news but really: Almost everyone with a lick of sense already has a stash of antihistamine on hand. A lot of folks just don’t realize how useful it is!
If I start having nasal congestion or a sore throat - which is frequently, because I live in the land of pollen (in some years there are actual DRIFTS of pollen from the trees all over the place) - I don’t think I have “the flu” or whatever: I think “I have a stuffy nose/sore throat” and I take antihistamine, go to bed early and VOILA!! The next day I feel great. (Or tolerable.)
One negative about the diphenhydramine type allergy meds is that they make me really, really sleepy. The loratadine variety (Claritin) is supposed to be “non drowsy,” and yes, I don’t feel sleepy on it, but otoh I feel sort of like I’m having an LSD flashback. (Mr K - not the one on this forum - will not take loratadine under any circumstances but he takes diphenhydramine/Benadryl almost every day before bedtime.)
D3 will prevent all the symptoms you take the drugs for...... at least it does for me