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The most efficient of these is beta-carotene, which is abundant in many vegetables, such as carrots, kale, and spinach ( Summary The best dietary sources of vitamin A include liver and fish oil

Watercress is a rich source of gluconasturtiin, the precursor of phenethyl isothiocyanate (PEITC), while garden cress is rich in glucotropaeolin, the precursor of benzyl isothiocyanate (BITC) (see Food sources)

The team also saw no decline in heart or lung function, suggesting the issue with fatigue is not originating in those organs

These results suggest that sublingual and oral B12 supplementation may serve as viable alternatives to IM injections, particularly in clinical settings where frequent intramuscular administration is impractical or resource intensive