Recent investigations have shown that of the patients who were affected by SARCov2 haveremained with persistent symptoms in a high proportion. In these considerations, theliterature has suggested nomenclatures such as "post-COVID-19" and "chronic COVID-19","long -COVID" and Post-Covid Syndrome for patients recovered from SARCov2 reportingpersistent symptoms and signs for weeks to months after resolution of the acuteinfection. Furthermore, there may be cardiovascular complications in affected patients,the consequences of which can lead to muscle contractility disorders, vascularinsufficiency, cardiac arrest, reinforcing the need for controlled, randomized studies,as well as follow-up and monitoring of these. Furthermore, cardiovascular diseases (CVD)are part of the health problems that lead to the most deaths in the world, they also leadto a high proportion of hospital admissions, due to the worsening of the pathology and ahigher incidence in the elderly population. The worsening of CVD conditions leads toinadequate food consumption at the hospital level, causing changes in several nutrients,including vitamin B12. The reduction in B12 levels leads to changes in several systems,including the cardiovascular system, and due to the increase in homocysteine and thetriggering of the inflammatory cascade. Studies indicate that B12 supplementation throughChlorella (microalgae - functional food) reduced cardiovascular risk and modulated theinflammatory cascade. In combination, neurostimulation has presented aspects that promotepain neuromodulation, due to the improvement of respiratory patterns and inflammatorymodulation. More specifically, there is a protocol with promoting findings, this beingHD-tDCS. In this sense, this research aims to evaluate the effects of HD-tDCS and theconsumption of Chlorella Pyrenoidosa to improve B12 levels in patients withcardiovascular risk post-COVID-19.