Cortisol supplementation effects
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Cortisol Supplementation Effects: Overview and Key Supplement Types
Cortisol is a hormone released in response to stress, and various supplements have been studied for their ability to influence cortisol levels. Research covers a range of supplements, including probiotics, amino acids, antioxidants, herbal extracts, proteins, fatty acids, and specific milk types, each with unique effects on cortisol regulation and stress response.
Probiotics and Cortisol Reduction
Multiple randomized controlled trials show that probiotic supplementation can decrease cortisol levels, especially in healthy individuals, those not taking other medications, and when a single probiotic strain is used. The effect appears more pronounced in studies conducted in Asia. However, the overall certainty of this evidence is low, and more targeted research is needed to clarify which subgroups benefit most and under what conditions these effects are strongest .
Amino Acids and Related Compounds: HMB-FA and Whey Protein
Supplementation with β-hydroxy β-methylbutyrate free acid (HMB-FA), an amino acid derivative, can alter cortisol responses during acute fasting. Specifically, HMB-FA reduces the cortisol awakening response after a 24-hour fast, particularly in males, but does not affect muscle protein breakdown . Whey protein isolate supplementation may also decrease the cortisol awakening response after strenuous exercise, though it does not appear to impact mood, heart rate variability, or short-term exercise performance .
Magnesium and Exercise-Induced Cortisol
Magnesium supplementation, when combined with intense exercise, increases cortisol levels in athletes at rest and after exhaustion. However, neither exercise nor magnesium alone has this effect; the increase is only seen when both are combined .
Antioxidants and Flavonoids: Tangeretin
Tangeretin, a citrus flavonoid, taken for four weeks can reduce both serum cortisol and adrenocorticotropic hormone (ACTH) levels in athletes undergoing high-intensity resistance training. This supplementation also enhances antioxidant capacity and may help reduce inflammation and speed up recovery after intense exercise .
Herbal Supplements: Withania somnifera (Ashwagandha)
Withania somnifera (Ashwagandha) supplementation has been shown to decrease cortisol secretion in stressed individuals, with no significant adverse effects reported in the short term. However, the long-term effects and impact on adrenal function remain unclear, so use should be supervised by a healthcare provider .
Omega-3 Fatty Acids: Fish Oil
Fish oil supplementation, rich in omega-3 fatty acids, can reduce both perceived stress and basal cortisol levels in abstinent alcoholics. While the peak and duration of stress-induced cortisol responses are not significantly changed, the timing of the peak may shift, suggesting a regulatory effect on the stress response .
Milk-Based Supplements: Asinine Milk
In animal models, asinine (donkey) milk supplementation reduces salivary cortisol levels and modulates immune responses during stress events such as weaning. This suggests potential for future human applications in stress management, though more research is needed .
DHEA Supplementation
Dehydroepiandrosterone (DHEA) supplementation has been investigated for its effects on cortisol and metabolic health, particularly in individuals with altered cortisol levels. While DHEA may help improve metabolic profiles, more research is needed to confirm its safety and efficacy, especially regarding liver health .
General Summary of Supplement Effects on Cortisol
A broad review of various supplements—including amino acids, electrolytes, antioxidants, and carbohydrates—shows that many can attenuate cortisol concentrations during high-intensity exercise. Amino acids help prevent muscle breakdown, electrolytes replace minerals lost in sweat, antioxidants limit oxidative stress, and carbohydrates can suppress immune responses and lower cortisol if given in sufficient amounts .
Conclusion
A wide range of supplements can influence cortisol levels, either by reducing stress-induced increases or by modulating baseline secretion. The effects vary depending on the supplement type, population, and context (such as exercise or stress). While some supplements like probiotics, tangeretin, ashwagandha, and fish oil show promise in lowering cortisol, others like magnesium may increase it under certain conditions. More research is needed to clarify long-term safety and identify which individuals will benefit most from specific supplementation strategies.
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