Ingredients
Niacin Upper Limit for Supplements: Where 35 mg Comes From
The niacin upper limit for supplements is 35 mg a day for adults 19 and older, as reported by NIH. It covers niacin from pills and fortified food, not from ordinary meals. A Protoflow serving lists 75 mg, which is more than twice that limit.
Written by the Protoflow label deskUpdated · 4 min read
The rule01
What is the niacin upper limit for supplements?
It is 35 mg a day of supplemental niacin for adults 19 and older, in both the nicotinic acid and nicotinamide forms.
NIH lists the adult need at 16 mg a day for men and 14 mg for women. The 35 mg figure sits above that need, but not by much (NIH ODS, Niacin).
The limit does not apply to people taking niacin under medical supervision (NIH ODS, Niacin).
The reason02
Why is the limit so low?
Flushing starts near it. Nicotinic acid at roughly 30 to 50 mg or more typically turns skin red and itchy.
A limit is the highest daily intake that is unlikely to cause harm for most people. Past it, the picture changes with the form and the time taken (NIH ODS, Niacin).
| Intake | What can happen |
|---|---|
| About 30-50 mg or more, nicotinic acid | Flushing, unpleasant but not toxic |
| High doses for months or years | Liver harm, more with extended-release forms |
| 1.5 g a day or more | Most likely to raise blood sugar |
The math03
How does Protoflow compare with the limit?
Two capsules hold 75 mg of niacin. That is 40 mg over the line, or about 2.1 times the limit.
The panel shows 469% of the Daily Value, a figure built on the 16 mg need. The form is not printed, so we cannot say how likely a flush is (Protoflow bottle label).
One serving past 35 mg does not mean harm. It means the product sits outside the range that has been judged safe for nearly everyone, so a clinician should know about it. See the niacin and vitamin E profile.
Protoflow: from $49 a bottle60 capsules · 2, 3 or 6 bottles · free US shipping on 3 or 6 · 60-day guarantee
See packsYour next step04
What if you already take other niacin?
Add it up. The limit counts every supplement and fortified food, not one bottle.
List each product
Check multivitamins, B-complex tablets and energy products for a niacin line.
Add the milligrams
Count only supplement and fortified-food niacin.
Show the total to a pharmacist
Bring the bottles, and keep taking prescribed medicine.
The skin reaction itself is covered in the niacin flush guide.
FAQ05
Protoflow questions people ask
Is 35 mg of niacin a day the same as the daily value?
No. The Daily Value on a label is built on the 16 mg adult need, while 35 mg is a ceiling for supplements. A label can show 469% of the Daily Value and still be a different number from the limit.
Does the niacin limit include niacin in food?
Not meat, fish or grains eaten as meals. NIH's limit is for niacin from supplements and fortified products (NIH ODS, Niacin). Fortified cereals count, so check those labels too.
Who can take more than 35 mg of niacin?
People whose doctor prescribes it. The limit does not cover niacin taken under medical supervision (NIH ODS, Niacin). Never raise a dose on your own because a prescriber once did.
What does extended-release niacin change?
Extended-release forms carry more liver risk than other forms when taken at high doses over time (NIH ODS, Niacin). The Protoflow label does not say which type it uses.
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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