Those sailors should be temporarily on higher doses of Vitamin D3 and zinc for a month or so. Guarantee that most of them will feel a lot better.
True enough,D3 is vital.
Spend some time here with a treasure trove of documented information of doctors in the U.S AND around the world SUCCESSFULLY treating patients with high dose Vitamin C and other products.
They do not want this known.
If the general population learns about this it will DERAIL their entire agenda.
https://mewe.com/group/5e45f92959b808281d05c94e