Ingredients
Niacin Flush Supplement Guide: Why Your Skin Turns Red
A niacin flush is a warm, red, tingling skin reaction that the nicotinic acid form of niacin can cause at doses of roughly 30 to 50 mg or more. It is unpleasant, not toxic. A Protoflow serving holds 75 mg of niacin and the label does not print the form, so a flush is possible.
Written by the Protoflow label deskUpdated · 4 min read
The reaction01
What is a niacin flush?
A niacin flush is a sudden wave of warmth and redness across the face, neck and chest, often with itching or tingling.
It comes from the nicotinic acid form of vitamin B3. NIH describes it as an unpleasant effect rather than a toxic one (NIH ODS, Niacin).
Nicotinamide, the other common form, does not cause it (NIH ODS, Niacin). That is why the form matters as much as the milligrams.
The numbers02
Which niacin doses cause flushing?
Nicotinic acid at about 30 to 50 mg or more typically causes it, and the upper limit for supplemental niacin is 35 mg a day.
The limit applies to adults 19 and older and does not cover people taking niacin under a doctor's care (NIH ODS, Niacin).
| Form | Flushing | Note |
|---|---|---|
| Nicotinic acid | Typical at about 30-50 mg or more | High doses over months can harm the liver (NIH ODS, Niacin) |
| Nicotinamide | Does not flush | Same upper limit applies |
| Protoflow label | Form not printed | 75 mg per 2 capsules, 469% DV |
On the label03
Could Protoflow cause a niacin flush?
It could. A serving carries 75 mg of niacin, more than twice the 35 mg upper limit, and the panel does not say which form it is.
The label reads "Niacin (Vitamin B3)" and nothing more. Without the form we cannot say if a flush is likely, only that the amount is in the range where nicotinic acid does it.
A flush is a skin reaction. It does not show that any ingredient is working. Read the full niacin line on the niacin and vitamin E page.
Protoflow: from $49 a bottle60 capsules · 2, 3 or 6 bottles · free US shipping on 3 or 6 · 60-day guarantee
See packsWhat to do04
What should you do after a flush?
Stay calm, let it pass and tell a pharmacist before the next dose.
- Skip the next dose and ask your pharmacist about the form and amount.
- Tell your doctor if you take a statin or other medicine, and keep taking what was prescribed.
- Call 911 for swelling of the lips or throat or trouble breathing.
More reactions are on the side effects page. For the limit itself, read why 35 mg is the line.
FAQ05
Protoflow questions people ask
How long does a niacin flush last?
Most flushes fade within an hour or so, though it varies by person and dose. A flush with hives or breathing trouble is different and needs urgent care.
Is a niacin flush dangerous?
On its own, no. NIH calls flushing an unpleasant effect, not a toxic one (NIH ODS, Niacin). The risk to watch is liver strain at high doses over months.
Does a red face after niacin mean it is working?
No. The flush is a skin reaction to nicotinic acid, and it tells you nothing about benefit.
Can you get used to a niacin flush?
Some people report that flushing eases with steady use, but NIH gives no rule. If it keeps happening, ask a pharmacist about the form and dose.
Does nicotinamide avoid the flush?
Yes, nicotinamide does not cause flushing (NIH ODS, Niacin). The 35 mg upper limit still covers it, so a flush-free label is not a license to take more.
Who wrote this06
Written and reviewed by
Pages built from the label, the brand pages and linked NIH, FDA, FTC, NICE and peer-reviewed sources.
Last updated . See our editorial standards and how we check reviews. This website is run by a USA authorized Protoflow retailer, not by the manufacturer or distributor, PhytoThrive Labs. We make money when you buy through our order links.
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