AFAIK there is one positive, randomized trial for a nasal spray containing Iota-Carrageenan (Carragelose): “The incidence of COVID-19 differs significantly between subjects receiving the nasal spray with I-C (2 of 196 [1.0%]) and those receiving placebo (10 of 198 [5.0%]). ” It is available at least in Europe, and in the UK I think under the brand name Dual Defence. Why it has not received more attention is beyond me.
AFAIK there is one positive, randomized trial for a nasal spray containing Iota-Carrageenan (Carragelose): “The incidence of COVID-19 differs significantly between subjects receiving the nasal spray with I-C (2 of 196 [1.0%]) and those receiving placebo (10 of 198 [5.0%]). ” It is available at least in Europe, and in the UK I think under the brand name Dual Defence. Why it has not received more attention is beyond me.