Instant coffee. Two jars of instant coffee,regular (right) and decaffeinated (left). Caffeine is a central nervous system stimulant,used to increase alertness and reduce physical fatigue. High use can result in physical dependence and subsequent withdrawal,as well as anxiety disorder and insomnia | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library |
Bildgröße: | 4217 px × 4217 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: |
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