By the time they hit the hospital, it’s likely too late for Vit D and Zinc. In many cases, they can look at the EKG at admittance and tell you what will happen. Covid can damage the heart.
COVID can damage the heart, but most of those cases of heart damage are persons who submitted to the mRNA injections. They damage the heart and immune system. When COVID comes calling, they are already compromised.
Zelensky had excellent results with HCQ/zinc sulfate/azithromycin as treatment. Others employed ivermectin as treatment. Hospitals were directed to put patients on remdesivir, wait for the kidney damage to flood the lungs, observe lowered SPO2 and place on a vent. The vent volume and O2% were cranked up until the lungs were damaged. Death often followed as SPO2 continued dropping. The hospitals scored $3,000 for the remdesivir and $39,000 for the vent. There was no incentive to treat for the purpose of sending home a recovered COVID patient.
I know of two cases that were "saved" by putting the patient on ECMO to allow the lungs to rest and dialysis to pick up the slack while the kidneys recovered. Both fully recovered.