A byproduct of vitamin B5 improved psoriasis symptoms in a small trial

Most nutrition findings in this space are about getting too little or too much of something from food. This one is different: it's about a compound the body makes from a vitamin, tested as an add-on treatment for a skin disease, and it's worth covering anyway because the mechanism runs straight through vitamin B5 and the evidence, while early, is unusually concrete for something that started in a petri dish.

The study

Researchers publishing in the Journal of Experimental Medicine describe an enzyme called Vanin that breaks down pantethine, a compound the body makes from vitamin B5 (pantothenic acid) on the way to building coenzyme A, a molecule nearly every cell needs to run its metabolism. In dendritic cells, a type of immune cell that helps trigger inflammation, high Vanin activity depletes pantethine and lets cholesterol and lipid rafts build up on the cell membrane. That buildup pushes the dendritic cells into a hyperactivated state the researchers linked to psoriasis-like inflammation. They also report finding elevated Vanin activity in dendritic cells from people with psoriasis.

In mice, supplementing pantethine, or blocking Vanin with a drug, reduced the cholesterol buildup, calmed the hyperactivated dendritic cells, and produced milder psoriasis-like skin disease: less skin thickening and fewer inflammatory immune cells in the skin.

The researchers then ran a small, single-center trial in 24 people with plaque psoriasis over 12 weeks. Everyone received a standard topical treatment (calcipotriol and betamethasone dipropionate); some also took oral pantethine, 300 mg twice a day. The group getting pantethine alongside the topical treatment showed greater improvement in psoriasis severity scores than the group on topical treatment alone, and the benefit was larger in patients who started the trial with elevated cholesterol.

What this design can and cannot tell you

Twenty-four patients at a single center is a pilot, not a definitive treatment trial, and the researchers themselves describe the human arm as proof-of-concept for clinical feasibility rather than confirmation that pantethine treats psoriasis. The mouse mechanism is well worked out, but mouse skin inflammation models don't always predict what happens in people, and this is the first human data of its kind, not yet replicated by another group. Pantethine was given as an add-on to an already effective topical regimen, not as a replacement for it, and nothing here says pantethine works alone. None of this makes the mechanism less interesting. It does mean pantethine is not an approved or established psoriasis treatment, and the honest read of a 24-person pilot is "promising enough to study further," not "proven."

Vitamin B5 content of common foods

Pantothenic acid gets its name from the Greek for "from everywhere," and that's close to accurate: it's present in nearly every food, which is exactly why deficiency is so rare. Ordered by amount per typical serving, using the NIH Office of Dietary Supplements' food data:

• Beef liver, pan-fried, 3 oz (85 g): about 5.9 mg (118% of the daily value)
• Shiitake mushrooms, cooked, ½ cup: about 2.6 mg (52% DV)
• Sunflower seeds, dry-roasted, 1 oz (about ¼ cup): about 2.0 mg (40% DV)
• Rainbow trout, cooked, 3 oz: about 1.9 mg (38% DV)
• Lobster, cooked, 3 oz: about 1.4 mg (28% DV)
• Chicken breast, roasted, 3 oz: about 1.3 mg (26% DV)
• Yogurt, plain, low-fat, 1 cup (8 oz): about 1.3 mg (26% DV)
• Avocado, raw, ½ fruit: about 1.0 mg (20% DV)
• Sweet potato, baked with skin, 1 medium: about 1.0 mg (20% DV)
• Milk, 1 cup (8 fl oz): about 0.87 mg (17% DV)
• Potato, baked with skin, 1 medium: about 0.7 mg (14% DV)
• Egg, 1 large: about 0.7 mg (14% DV)
• Lentils, boiled, ½ cup: about 0.63 mg (13% DV)
• Broccoli, boiled, ½ cup: about 0.48 mg (10% DV)
• Oats, cooked, ½ cup: about 0.4 mg (8% DV)
• Orange, 1 medium: about 0.3 mg (6% DV)
• Peanuts, dry-roasted, 1 oz: about 0.29 mg (6% DV)
• Whole wheat bread, 1 slice: about 0.21 mg (4% DV)

Different nutrient databases list slightly different values for the same food, since B5 content shifts with cut, feed, soil and cooking method, so treat the figures above as representative rather than exact.

The recommended intake

The US adequate intake (AI) for pantothenic acid, a softer standard than an RDA because the evidence base is thinner, from the NIH Office of Dietary Supplements:

• Infants 0–6 months: 1.7 mg/day
• Infants 7–12 months: 1.8 mg/day
• Children 1–3 years: 2 mg/day
• Children 4–8 years: 3 mg/day
• Children 9–13 years: 4 mg/day
• Teens and adults 14 and older: 5 mg/day
• Pregnancy: 6 mg/day
• Breastfeeding: 7 mg/day

There is no tolerable upper limit (UL) for pantothenic acid. The National Academies found insufficient evidence to set one, and the NIH's consumer fact sheet describes it as safe even at high doses.

Too little, and too much

Too little is rare enough that it has mostly been documented in people on diets containing almost no pantothenic acid at all, such as prisoners of war studied after World War II, or in controlled research diets designed to induce deficiency. Reported signs include numbness and a burning sensation in the hands and feet, headache, fatigue, irritability, restlessness, disturbed sleep and gastrointestinal upset. Because the vitamin is in nearly every food, a diagnosed deficiency in someone eating normally is not something to expect.

Too much, from food or ordinary supplements, has not been shown to cause harm. Very high doses, on the order of 10,000 mg a day of pantothenic acid or calcium pantothenate, have been associated with an upset stomach and diarrhea, but nothing more serious. Pantethine, the compound used in the psoriasis trial, is a different substance taken at a different kind of dose (600 mg a day there, split into two doses), and the trial did not report it causing problems, but anyone considering it for a specific condition should raise that with a dermatologist first, not treat it as a vitamin top-up.

Tracking it in AIM

AIM does not track vitamin B5 as standard, so add it as a custom metric: give it a name, a unit (mg) and a daily target of 5 mg, 6 mg if pregnant or 7 mg if breastfeeding, and it is estimated on every meal from then on, pinned to your cards or left behind "more." Any custom nutrient works the same way. Pantethine itself, the compound in the trial above, is a supplement rather than something a meal photo would ever need to estimate, so it sits outside anything AIM or this list tracks.

Estimates from a photograph carry real uncertainty for micronutrients, because content varies with soil, cultivar, storage and cooking in ways no image contains. Treat the week as meaningful and any single day as approximate, and treat this particular finding more cautiously still: a mechanism worked out in mice plus one small human pilot is an early signal, not a settled fact about what pantethine does for psoriasis.