The Power of B Vitamins

B Vitamins for Skin: The Ones That Help, the One That Stars, and the Two That Can Cause Breakouts

Short answer: All eight B vitamins support skin indirectly, because they run energy production, cell turnover and fat metabolism. For skin specifically, Vitamin B5 (pantothenic acid) has the strongest case: it's required to make coenzyme A, which the body uses to process fats including sebum, and there's early evidence high doses reduce acne lesions. Vitamin B3 (niacinamide) supports the barrier and calms inflammation. Two cautions: high-dose B12 and biotin supplements are known to trigger breakouts in some people, and high-dose B6 has a nerve-damage warning.

B vitamins get sold as an "energy complex," which is a bit like calling a car "a thing with cup holders." Technically true, misses the point. The B group runs the chemistry that turns food into cells, including skin cells, and when any of them run low, skin is often where it shows first.

Here's the whole family, what each one actually does for your skin, and, because nobody else tells you this, which ones can make acne worse.

B vitamins and skin, at a glance

Vitamin B1 (thiamine): the engine

Thiamine converts carbohydrates into energy and keeps nerves firing. The body stores very little and cooking destroys a fair proportion, so it needs to come in daily from wholegrains, legumes, seeds and pork. Low levels show up as fatigue, irritability and poor concentration before anything visible on the skin. Its skin role is indirect: no energy, no cell turnover.

Vitamin B2 (riboflavin): the repairer

Riboflavin is the one deficiency dermatologists recognise on sight: cracked lips, sore splits at the corners of the mouth, and a greasy, scaly rash around the nose and eyebrows. It's involved in tissue repair and wound healing, which makes it a quiet contributor to skin that heals cleanly after a breakout. Eggs, dairy, almonds and mushrooms cover it; vegans should watch intake.

Vitamin B3 (niacin and niacinamide): the calmer

Severe B3 deficiency causes pellagra, the "four Ds" (dermatitis, diarrhoea, dementia, death), with a red, cracked rash on sun-exposed skin. That's rare in Australia, thanks partly to Vegemite and fortified flour.

For skin, the useful form is niacinamide. It strengthens the barrier, reduces redness and inflammation, and helps regulate oil, which is why it's in so many acne serums and why we include it alongside B5 in our Extra Strength Acne Control Vitamins. Note the two forms aren't interchangeable: niacin (nicotinic acid) causes flushing at higher doses; niacinamide doesn't.

Vitamin B5 (pantothenic acid): the star

This is the one the brand is named for, so here's the honest version of why.

B5 is required to make coenzyme A, a molecule involved in almost every step of fat metabolism, including how skin cells produce and process sebum. The theory, first proposed in the 1990s, is that acne-prone skin has a relative shortfall of coenzyme A in the sebaceous glands, and that high-dose B5 helps the glands handle fats properly instead of pumping out excess oil. A small placebo-controlled trial published in 2014 found a pantothenic-acid-based supplement reduced total and inflammatory lesions over 12 weeks. That's one study, and it's early evidence rather than settled science, but it's more clinical support than most "skin vitamins" have.

Applied to skin as panthenol (pro-vitamin B5), it's a proven humectant and barrier supporter, which is why it's in our Acne Control Moisturiser and Cleansing Mousse as well as the supplements.

Food sources: avocado, mushrooms, chicken, eggs, legumes, sweet potato. Dietary deficiency is rare; the therapeutic doses used for acne are far above what food provides, which is the point of supplementing.

Vitamin B6 (pyridoxine): the hormonal one, with a caution

B6 is a coenzyme in over a hundred reactions, including protein metabolism and the production of neurotransmitters and hormones. It's the B vitamin most linked to PMS symptoms, and some women find it helps with breakouts that track their cycle. Low B6 shows as a scaly rash, cracked lips, low mood and poor sleep.

The caution: high-dose B6 taken long-term can cause peripheral neuropathy (tingling, numbness in hands and feet). Australia's regulator has required warnings on supplements above a certain daily dose. Get B6 from food (chickpeas, salmon, potatoes, bananas) or a balanced complex, not a standalone megadose, and stop and see a GP if you notice tingling.

Vitamin B7 (biotin): the hair vitamin that can cause pimples

Biotin builds keratin, the protein in hair, nails and the outer skin. Genuine deficiency is rare and causes hair thinning and a scaly rash. Most people take it for hair and nails.

The catch: high-dose biotin supplements (the 5,000–10,000 mcg "hair, skin and nails" kind) are widely reported to trigger acne in some people, possibly by competing with B5 for the same absorption pathway. If your breakouts started around the time you started a hair supplement, that's worth a two-week test without it. Biotin also interferes with some blood tests, including thyroid and troponin; tell your doctor if you take it.

Vitamin B9 (folate): the builder

Folate works with B12 to make DNA and new cells, which is the raw material of skin renewal. Deficiency mainly causes anaemia and fatigue, with slow healing and mouth ulcers over time. Leafy greens, legumes and fortified bread cover it; folic acid in pregnancy is a separate, essential conversation with your GP.

Vitamin B12 (cobalamin): essential, and a known acne trigger at high doses

B12 keeps nerves and red blood cells healthy, and deficiency (common in vegans and older adults) causes fatigue, anaemia and sometimes darkened patches of skin. It's essential.

But: high-dose B12 supplements and injections are one of the best-documented supplement-related acne triggers. Research has shown that excess B12 changes the behaviour of skin bacteria in a way that promotes inflammation, and case reports of sudden acne after B12 injections go back decades. If you need B12, take what you need, not a megadose, and if your skin erupts after starting it, talk to your prescriber.

How to get your B vitamins for skin

• Food first. Wholegrains, legumes, eggs, leafy greens, nuts, seeds, fish, mushrooms and avocado cover the whole family. Vegans should supplement B12 and watch B2.
• A balanced complex over megadoses for general health. Megadoses of B6, B7 and B12 are where the problems live.
• High-dose B5 with B3 specifically for acne, because that's the pair with a mechanism and early evidence behind it. Our Extra Strength Acne Control Vitamins are formulated around exactly that, without the biotin or B12 megadoses that can push things the wrong way.
• Topical B5 and B3 for barrier and inflammation, in whatever cleanser and moisturiser you use daily.

FAQs

Which B vitamin is best for acne?
Vitamin B5 (pantothenic acid) has the strongest case, with a plausible mechanism around sebum metabolism and early clinical evidence at high doses. Vitamin B3 (niacinamide) is the runner-up for calming inflammation and supporting the barrier.

Does vitamin B12 cause acne?
It can. High-dose B12 supplements and injections are a well-documented trigger for acne in some people. Take only what you need, and review it with your doctor if breakouts start after you begin it.

Does biotin cause acne?
High-dose biotin (typical of hair and nail supplements) is widely reported to trigger breakouts, possibly by competing with B5 for absorption. Try two weeks without it if your acne started around the same time.

Is niacinamide the same as niacin?
Both are forms of vitamin B3, but they behave differently. Niacinamide is the form used in skincare and acne supplements; niacin causes flushing at higher doses and is mainly used for cholesterol.

Can B vitamins be harmful in high doses?
Most are water-soluble and excess is excreted, but three have known issues: high-dose B6 can cause nerve damage, and high-dose B12 and biotin can trigger acne. A balanced complex or a targeted formula is safer than random megadoses.

Do I need a B vitamin supplement for skin?
If you eat a varied diet, probably not for general skin health. If you have acne, a high-dose B5 and B3 formula is the one worth considering, alongside a topical routine.

The B vitamins for skin, without the ones that backfire. SkinB5 Extra Strength Acne Control Vitamins: high-dose Vitamin B5 with Vitamin B3, formulated to support oil balance and skin renewal from within.

Related reading: How SkinB5's Tablets and Caplets Work From the Inside Out · Does Lack of Sleep Cause Acne? · Prebiotics, Probiotics and Skin Health

References (from the original article):

• Cohen, M., & Braun, L. (2005). Herbs & Natural Supplements: An Evidence-based Guide, 1st ed. Elsevier Health Sciences.
• WebMD, "Pantothenic Acid (Vitamin B5)" monograph, https://www.webmd.com/vitamins/ai/ingredientmono-853/pantothenic-acid-vitamin-b5