Hair and nails noticeably grow faster when I'm drinking this consistently. 300 mcg of biotin.
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Caffeine at ~200 mg per serving reliably increases alertness and short-term energy expenditure in RCTs, and green tea extract shows modest thermogenic effects in some trials. However, Celsius's proprietary blend and marketing claims about fat-burning and metabolic acceleration lack direct human trial support. The drink's overall efficacy for weight loss or sustained metabolic boost is not established; it functions primarily as a high-caffeine beverage with unproven synergistic ingredients.
Celsius contains caffeine (~200 mg per 12 oz can), taurine, guarana, and a proprietary blend of B vitamins and plant extracts (ginger, green tea extract with EGCG, chromium). The caffeine and guarana act as central nervous system stimulants to increase alertness and energy. Green tea extract (EGCG, epigallocatechin gallate) may modestly increase fat oxidation and thermogenesis. Taurine is an amino acid with potential roles in muscle function and antioxidant defense, though its contribution to acute energy is unclear.
Observational
“Objectives: This study evaluated the effects of acute and 28-day supplementation with a caffeine-based energy drink on energy expenditure, fat oxidation, and cognitive performance.”
“Twelve young healthy male volunteers participated in a randomized blind study in which they consumed 150 ml decaffeinated coffee with or without 200 mg added caffeine.”
“It has been reported that green tea has a thermogenic effect, due to its caffeine content and probably also to the catechin, epigallocatechin-3-gallate (EGCG).”
“BACKGROUND: Green tea consumption is reportedly associated with various health-promoting properties.”
The proprietary blend obscures the actual doses of most active ingredients, making it impossible to verify whether they match efficacious levels from published studies. Green tea extract's thermogenic effect is small (~80–100 kcal/day in trials) and may not translate to meaningful weight loss. No RCT has tested Celsius itself for fat loss or metabolic acceleration. High caffeine content (~200 mg) can cause jitteriness, sleep disruption, and dependence in sensitive individuals. Marketing claims about 'MetaPlus' and accelerated metabolism are not substantiated by peer-reviewed evidence.
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