The Lancet study had no Zinc, but the “Philip Carlucci, Tania Ahuja, Christopher M Petrilli, Harish Rajagopalan, Simon Jones, Joseph Rahimian” study HAD ZINC and they wrote that ZINC MAY play a role in therapeutic management for COVID-19.
There are no “limitations”, that is what they stated, despite having favorable results with the addition of zinc.
PS President Trump also took Zinc at the same time he took HOQ. he said so at a press conference.