This post covers the changes I’ve made to the N95 vs FFP3 & FFP2 masks article over time.

July 11, 2020 – Updated:

  • Added section on risk mitigation for airplane flights.

May 22, 2020 – Updated:

  • Added section and research on indoor vs outdoor spread.

May 13, 2020 – Updated:

  • Added section on selenium

May 12, 2020 – Updated:

  • Added section on shaving when using disposable respirators
  • Updated Vitamin D section to include the 2 latest studies on Covid-19 and vitamin D status – including listing what are considered normal, insufficient and deficient blood levels of 25(OH)D in those studies.
  • Add list from European Safety Federation of fake/suspicious PPE certificates.
John Alexander

Posted by John Alexander

Note: Not a Medical Doctor or PhD. I'm a researcher and writer, with a focus on the subjects of health and longevity. My intent is to write about scientific research in an accessible, understandable way. If you believe something I've stated needs a reference, and I haven't done so, please let me know in the comments. Follow on: Twitter

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20 days ago

Hi John, thanks for sharing. A question, as per your research, what do you know about 3 layers cloth masks of polyester and cotton or other material (i read that polyester creates electrostatic barriers that attract the virus), plus a PM2.5 Filter. That would create an 8 layer protection mask. I understand that it is NOT reaching the level of protection for the wearer that N95, FFP2 or FFP3 respirators. But if we are not healthcare or frontliners, comparing these kind of 8 layers masks seems to me that between the universe of cloth masks, this alternative could be a… Read more »

2 months ago

Excellent work – thanks so much for this!

2 months ago

So very helpful. Thank you very much! Cleared up confusion on masks and respirators. Also going to increase my selenium intake and get D3 supplements to beef up immune system!

2 months ago

thank you 🙂