Fatigue and low energy (supplement marketing)
Umbrella request «I have no energy, I need vitamins». Supplement manufacturers actively promote B vitamins, ginseng, eleuthero and coenzyme Q10 as «energy boosters», appealing to the role of B vitamins in ATP metabolism. In patients without confirmed deficiency such use does not outperform placebo.
ICD-10 R535 drugs
Also known as: Fatigue supplements, Vitamins for energy, Energy boosters
Drugs used for this condition
Marketing claims without evidence base
The drug is promoted for these uses outside international guidelines. Each entry below is analyzed against AEMPS, FDA, EMA, Cochrane and major RCTs.
- DL-ornithineNot recommended · Urea cycle amino acid, adjunct for hyperammonaemiaL-ornithine is an amino acid marketed in supplements for fatigue, energy, and better sleep. Direct evidence is thin and comes from a few small trials in healthy volunteers. In Miyake et al. (2014, n=52, 400 mg/day for 8 weeks) subjective sleep quality improved and the cortisol/DHEA-S ratio fell, yet fatigue on most POMS subscales did not change; earlier small studies by Sugino (2008, n=17) and Demura (2011, n=10) reported less subjective fatigue after exercise in tiny samples. EFSA did not substantiate any benefit claim for L-ornithine, judging the submitted data insufficient, and the amino acid appears in no international guideline for fatigue or sleep disorders. No harm is documented at usual doses, so this pair sits at tier D: benefit unproven, net-negative not established.
- DPantothenic acidNot recommended · Water-soluble vitamin B5Pantothenic acid (vitamin B5) is added to supplements and marketed for fatigue and a boost of energy. In people without a deficiency (which is very rare), supplements have not shown convincing benefit for tiredness or low energy, and there is no evidence base for this use. Persistent fatigue responds to something else: find the cause (poor sleep, low iron, anemia, thyroid problems) and address it with a doctor.
- DRiboflavinNot recommended · Water-soluble vitamin B2Riboflavin is vitamin B2. Supplements market it "for energy" and against fatigue, pointing to the vitamin's part in metabolism. In people without a B2 deficiency, riboflavin has shown no clear benefit for tiredness or low energy, and there is no evidence base behind this use. Lasting fatigue usually traces back to poor sleep, anemia, thyroid problems or depression, so finding the cause with a doctor helps more than a vitamin. Riboflavin is harmless in this role, but do not take it instead of treatment with proven benefit, or you may miss the real reason for the fatigue
- DThiamineNot recommended · Water-soluble vitamin B1Thiamine (vitamin B1) is a water-soluble vitamin involved in carbohydrate metabolism. Supplement brands often market it for "energy" and against fatigue in people who have no deficiency. In people with normal thiamine levels, no convincing benefit for fatigue has been shown: there is no evidence base for this use. Fatigue itself calls for finding the cause, since poor sleep, iron deficiency, thyroid problems and depression are treated differently, and a doctor matches the approach. True thiamine deficiency is a separate medical situation and gets corrected when indicated, not taken "for a boost." At this dose and for this purpose the substance is safe, but do not take it instead of proper evaluation and treatment with proven benefit, or you may miss the real cause of the fatigue.
How to read tiers A–F
Evidence tiers belong to the drug-indication pair, not to the drug as a whole: the same substance can be A for one condition and F for another.
- AStrong evidence – first or second line in international guidelines
- BRecommended in selected cases
- CStudy data contradict each other
- DBenefit not proven, no documented harm
- FDocumented harm, or risk without benefit