Vitamin B5
Pantothenic Acid (Vitamin B5)
Pantothenic acid (Vitamin B5) is a water-soluble B vitamin essential for the synthesis of coenzyme A (CoA) and the acyl carrier protein, making it indispensable for energy metabolism and the synthesis of fats, proteins, and carbohydrates. It is widely used as a dietary supplement to support energy production, adrenal function, and skin health, and is a common ingredient in hair and skincare formulations. High-dose pantothenic acid (as pantethine, a derivative) has also been studied for its lipid-lowering properties.
Mechanism of Action
Pantothenic acid is converted in cells to 4'-phosphopantetheine and subsequently to coenzyme A, a critical cofactor involved in over 100 metabolic reactions including the citric acid cycle, fatty acid oxidation and synthesis, and acetylcholine synthesis. It also serves as the prosthetic group of acyl carrier protein, which is essential for de novo fatty acid synthesis. Additionally, CoA-dependent acetylation reactions are involved in gene expression regulation and histone modification.
Evidence by Health Goal(13 goals)
Dosing Protocols
With meals
The RDA is only 5mg/day; supplemental doses of 500-1000mg are used for general wellness and adrenal support. For lipid management, pantethine at 600-900mg/day in divided doses is more commonly studied. Doses up to 10g/day have been used in acne research, though GI side effects increase at higher doses.
Apply to cleansed skin or affected area
Dexpanthenol (provitamin B5) is the topical form used in skincare and wound healing. Concentrations of 1-5% are standard in moisturizers and barrier-repair formulations. Used for wound healing, dry skin, and as a humectant. Well-tolerated even with prolonged use.
Safety & Side Effects
Pantothenic acid has an excellent safety profile with no established tolerable upper intake level (UL) set by major health authorities due to low toxicity; adverse effects are primarily gastrointestinal and dose-dependent. It is not a controlled substance and is freely available over the counter worldwide, making it one of the safest B vitamins at supplemental doses.
Possible Side Effects
- !Gastrointestinal discomfort (nausea, diarrhea) at doses above 2g/day
- !Loose stools or diarrhea with high oral doses (>10g/day)
- !Mild heartburn or stomach upset at supplemental doses
- !Contact dermatitis (rare) with topical dexpanthenol in sensitive individuals
- !Headache reported rarely at very high doses
- !Water retention reported anecdotally at very high therapeutic doses
Interactions
- -May slightly enhance the lipid-lowering effects of statins when taken as pantethine — monitor lipid levels
- -Oral contraceptives and hormone replacement therapy may increase pantothenic acid requirements
- -High-dose biotin and pantothenic acid may compete for intestinal absorption via shared sodium-dependent multivitamin transporter (SMVT)
- -May modestly potentiate the effects of cholinesterase inhibitors due to shared role in acetylcholine synthesis — use caution in neurological conditions
- -Alcohol consumption chronically depletes pantothenic acid levels, increasing supplementation needs
Cost & Where to Buy
Generic pantothenic acid capsules are inexpensive and widely available. Pantethine (the active derivative used for lipid management) costs significantly more, typically $25-50/month. Topical dexpanthenol products vary widely by brand and formulation.
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