How to feel more energetic...?

Ladies are there any ways you use to feel more energetic throughout your day? 
I work 7am-3pm 5 days a week and 6am-12 on Saturdays sometimes and im always so so tired by the end of every shift. I got to bed at pretty reasonable times (between930-11) but still feel so exhausted by the end of the day..... Would like to know of any foods or supplements to boost energy so I'm feeling great by the time I finish work! 
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Ce

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Drink "awake" black tea. Also taking B12 helps.