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Pantothenic Acid (Vitamin B5)
The bottle says energy, adrenal support, stress. Pantothenic acid is vitamin B5, and it's in nearly every food you eat; no adult on a normal diet has been deficient since the 1940s POW camps IOM 1998. It won't give you energy or "support your adrenals." Both claims have been tested and failed. What B5 is actually good for is three narrow things the label never mentions, and knowing which is which saves you money and points you at the one that fits.
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It's a real cofactor that your body already keeps topped up. B5 is the raw material for coenzyme A, which your cells use to burn sugar and fat and make cortisol 1. That's central, but being necessary isn't the same as being limiting. Once your pools are full, extra B5 leaves in your urine; cells don't stockpile more cofactor because you swallowed more precursor 1. You need about 5 mg a day, roughly an egg plus some seeds, or a chicken thigh and yoghurt 1.

The two headline claims are the two that fail. "Energy" was tested directly: cyclists given B5 derivatives showed no change in oxygen uptake, time-to-exhaustion, or how they burned fuel during exercise 2. "Adrenal support" traces to old rat studies of deficiency and was never shown in a fed human; "adrenal fatigue," the frame it's sold under, has no validated test and no evidence it exists 3. Your afternoon slump is sleep, glucose, or being a person.

Three narrow uses are real, and each is a different molecule from the standard B5 tablet:

  • Pantethine, a sister molecule, drops LDL about 11% at 600 mg/day over four months, in people already on a good diet 4 5.
  • Dexpanthenol, the cream form, repairs damaged skin barrier and speeds healing after burns and wounds; it's been the active in Bepanthen since 1944 6.
  • Oral B5 at gram scale cleared about two-thirds of acne lesions versus two-fifths on placebo in one 48-person trial 7.

For energy, stress, or "adrenals," don't buy it โ€” save the money. If one of the three real uses fits you:

The fine print โ€” when to skip it, and what people get wrong

Pantethine and calcium pantothenate are labelled alike but do different things; the lipid effect belongs to pantethine only. Every modern pantethine and acne trial was funded by the maker and never independently replicated, so treat the effect size as a ceiling 7.

Very safe: no upper limit set, worst effect is loose stools at multi-gram doses 1. Don't stack multi-gram biotin with multi-gram B5: one case of dangerous fluid around the heart and lungs 8. In pregnancy, skip the gram-scale carve-outs entirely.

"B5 did nothing for me" is usually one of three: you expected an energy boost you were never short of; you bought calcium pantothenate expecting the pantethine lipid effect; or acne quieting down on its own looked like the pill worked. Read the molecule on the bottle before you start.

References
  1. 1IOM (1998). Dietary Reference Intakes for Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, Vitamin B12, Pantothenic Acid, Biotin, and Choline. link
  2. 2Webster MJ (1997). Physiological and performance responses to supplementation with thiamin and pantothenic acid derivatives. European Journal of Applied Physiology and Occupational Physiology. link
  3. 3Cadegiani FA, Kater CE (2016). Adrenal fatigue does not exist: a systematic review. BMC Endocrine Disorders. link
  4. 4Gaddi A, Descovich GC, Noseda G, Fragiacomo C, Nicolini A, Montanari G, Vanetti G, Sirtori M, Gatti E, Sirtori CR (1984). Controlled evaluation of pantethine, a natural hypolipidemic compound, in patients with different forms of hyperlipoproteinemia. Atherosclerosis. link
  5. 5Evans M, Rumberger JA, Azumano I, Napolitano JJ, Citrolo D, Kamiya T (2014). Pantethine, a derivative of vitamin B5, favorably alters total, LDL and non-HDL cholesterol in low to moderate cardiovascular risk subjects eligible for statin therapy: a triple-blinded placebo and diet-controlled investigation. Vascular Health and Risk Management. link
  6. 6Proksch E, de Bony R, Trapp S, Boudon S (2017). Topical use of dexpanthenol: a 70th anniversary article. Journal of Dermatological Treatment. link
  7. 7Yang M, Moclair B, Hatcher V, Kaminetsky J, Mekas M, Chapas A, Capodice J (2014). A randomized, double-blind, placebo-controlled study of a novel pantothenic acid-based dietary supplement in subjects with mild to moderate facial acne. Dermatology and Therapy. link
  8. 8Debourdeau PM, Djezzar S, Estival JL, Zammit CM, Richard RC, Castot AC (2001). Life-threatening eosinophilic pleuropericardial effusion related to vitamins B5 and H. Annals of Pharmacotherapy. link
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