Immune Support

I read there is available an immune support package available for NHS frontline staff.
[www.crowdfunder.co.uk]

Packs include:

Liposomal Vitamin C
Vitamin D
Zinc
Reishi-Cordyceps Complex
Homeopathic Remedies
Essential Oils
And only the BEST!

As they don't offer any details of their packs, I wonder if we could formulate our own?
Any suggestions any one.