Methods and formulations for treating and preventing LONG COVID sequelae are provided. An example method treats loss of smell and taste from SARS-CoV-2 infection, including assessing the patient, administering a composition with dosage between 1750-3600 mg per day, wherein the composition comprises a mixture of at least a withanolide-A, a boswellic acid, a [6]-gingerol, and a curcuminoid. Another example method treats memory loss or brain fog from SARS-CoV-2 infection, including assessing the patient, and administering a regenerative and neuroprotective composition comprising a mixture of withanoside VI, withanolide A, a Boswellia serrata plant, a Zingiber officinale rhizome, and a Curcuma longa rhizome. The compositions were found effective, achieving statistical significance in a multi-center, randomized, double-blind, placebo-controlled phase III clinical trial.