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When circulation is compromised, oxygenation is low, or collagen is depleted, the result is visible: dilated blood vessels, pooled blood, and increased pigmentation all show up more easily here than anywhere else on the face

I never had Covid but maybe I had it and was asymptomatic and like in your case the vaccine triggered something and disrupted sleep

[73] Streptomyces griseus , a bacterium once thought to be a fungus, was the commercial source of vitamin B 12 for many years

Interestingly, in experiments using hamsters the cuprizone concentration needed to be increased to 3% or even 5%compared to 0.2%0.5% in experiments on mice or ratto induce brain alterations