What does a lack of serotonin cause?

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Tags

1. #cause
2. #changes
3. #factors
4. #genetic
5. #absorption
6. #serotonin
7. #impair
8. #faulty
9. #build
10. #reduces
11. #sunlight
12. #neurotransmitter
13. #which
14. #metabolism
15. #ability
16. #breakdown
17. #imbalances
18. #levels
19. #issues
20. #hormone
21. #digestive
22. #contributes