B6 Powder: How to Read Label Units, Strength and Totals

B6 powder is vitamin B6 sold as a loose powder, either on its own or as one ingredient in a drink mix. To know how much vitamin B6 you would get, read the milligram (mg) amount on the Supplement Facts panel together with the serving it refers to, then add it to every other product you use. U.S. rules require the listed amount to be the vitamin itself in one serving, and the percent Daily Value (%DV) is that amount divided by the Daily Value, which is 1.7 mg for adults and children 4 years and older. [1] [2] Powders differ enormously in strength: among the labels compared below, one declares 50 mg of vitamin B6 in a 50 mg serving, and another declares 1.9 mg in a 16 g packet. [3] [4] A more concentrated powder is not a better form. The NIH Office of Dietary Supplements (ODS) says absorption does not differ substantially among the forms of vitamin B6 in supplements, and the upper limits set for vitamin B6 count food and supplements together. [2]

This page is general education about reading labels. It does not recommend any product or amount. If you take medicines, are pregnant or breastfeeding, or are considering a B6 product for a child, talk with your doctor or pharmacist first. [2] [5]

Safety first: if you notice tingling, burning or numbness in your hands or feet while using any product that contains vitamin B6, stop the product and seek medical advice as soon as possible. [6] [7]

Use the ingredient-label checklist

Five B6 powder labels compared

Method. The table uses five powder records from the NIH Dietary Supplement Label Database (DSLD), which captures the information printed on supplement labels sold in the United States, and identifies each by its DSLD record number. [8] DSLD records what labels declare, not what products have been tested to contain, and it includes products that are no longer sold, so check any entry against the label you have. [8] The per-gram figures are calculated from each label’s declared amount and serving weight.

The same word covers very different strengths. Gram for gram, label A declares more than 8,000 times as much vitamin B6 as drink mix D (1,000 mg against about 0.12 mg). [3] [4] Labels A and B tell the user to use an accurate milligram scale, and say their contents are sold by weight, not volume, and that settling may occur. [3] [9] A precise scale makes a labeled amount easier to measure. It does not show that the amount is appropriate for you.

Form names change how the line reads. Label B lists pyridoxal 5-phosphate under its own name with “Daily Value not established”, while label E lists vitamin B6 “as pyridoxal 5-phosphate” with a %DV. [9] [11] FDA requires ingredients without a Daily Value to be marked with a symbol that points to the footnote “Daily Value Not Established.” [12] When a label names a B6 form without giving a vitamin B6 amount, ask the manufacturer or a pharmacist how much vitamin B6 it provides.

Two 50 mg servings, two different B6 amounts. Labels A and C both describe single-ingredient pyridoxine hydrochloride powder with a 50 mg serving, but A declares 50 mg of vitamin B6 and C declares 41 mg. [3] [10] FDA says the panel lists the weight of the nutrient rather than the weight of its source compound, using calcium and calcium carbonate as its example, [12] and federal rules require the amount to be the vitamin in one serving. [1] The labels do not explain the difference, so ask the manufacturer what the declared figure refers to.

Check the percentage. Dividing 41 mg by the current 1.7 mg Daily Value gives about 2,412%, not the 2,057% recorded for label C. [2] [10] Label C’s record was entered in 2013, so note the date of any label or record and recalculate the percentage yourself.

How to read B6 units on a label

• Amount and unit. Vitamin B6 is listed in milligrams per serving, and the amount must be the vitamin in one serving of the product. [1]
• Serving size. FDA defines one serving as the maximum amount the label recommends per occasion, or one unit, such as a packet, when the label gives no recommendation. [12] The mg figure applies to that serving only.
• Source in parentheses. The compound that supplies the vitamin may follow in parentheses after “as” or “from”, as in “Vitamin B6 (as pyridoxine hydrochloride)”. [1] ODS says pyridoxine hydrochloride is the most common form in supplements and that some supplements contain pyridoxal 5-phosphate (PLP). [2]
• Percent Daily Value. %DV is the amount divided by the Daily Value and multiplied by 100, rounded to the nearest whole percent. [1] For vitamin B6 the Daily Value is 1.7 mg. [2]
• Other names. Australia’s Therapeutic Goods Administration (TGA) advises looking for pyridoxine hydrochloride, pyridoxal 5-phosphate and pyridoxal 5-phosphate monohydrate, because Australian product labels do not always have to say “vitamin B6”. [6] U.S. labeling rules differ, but checking for every form name helps you find each B6 line.

Adding up total vitamin B6

Upper limits apply to your whole day, not to one label. The Food and Nutrition Board’s Tolerable Upper Intake Level (UL), defined as the maximum daily intake unlikely to cause adverse health effects, counts vitamin B6 from food and supplements together. [2]

Hypothetical example. Suppose someone used one labeled serving of drink mix D and one of drink mix E on the same day. Together, those two labels declare 1.9 mg + 10 mg = 11.9 mg of vitamin B6, about 700% of the Daily Value, before counting a multivitamin, a B-complex, fortified foods or ordinary meals. [2] [4] [11]

Authorities set different limits. The Food and Nutrition Board’s ULs are 100 mg a day for adults and lower for children: 30 mg at ages 1 to 3, 40 mg at 4 to 8, 60 mg at 9 to 13 and 80 mg at 14 to 18. [2] In 2023 the European Food Safety Authority set an upper limit of 12 mg a day for all adults, including during pregnancy and breastfeeding. [2] The TGA says nerve damage (peripheral neuropathy) can occur at doses below 50 mg, that the risk appears to vary between people, and that it can occur when people take several products containing vitamin B6. [6] An upper limit is not a recommended amount, and the Food and Nutrition Board’s limits do not apply to people receiving vitamin B6 as medical treatment, who should be under a physician’s care. [2]

The TGA notes that vitamin B6 appears in multivitamins and in magnesium, zinc and iron supplements, is added to some breakfast cereals and energy drinks, and can be hard to keep track of when you use several products. [7] ODS notes that FDA does not require food labels to list vitamin B6 unless it has been added to the food. [2] For practice reading serving sizes on Nutrition Facts panels, see the food label reading worksheet. If one of your products is a B-complex, the guide to a plant based vitamin B complex explains how to check its vitamin forms and other ingredients.

Ingredient-label checklist for B6 powder

Use these steps with each physical label in front of you, and write down the date you checked.

• Find every B6 line. Look for “vitamin B6” and for the form names pyridoxine hydrochloride, pyridoxal 5-phosphate and pyridoxal 5-phosphate monohydrate. [6]
• Read the amount with its serving. Note the milligrams of vitamin B6 and the serving size they refer to, in grams or milligrams. The serving is the most the label recommends per occasion. [1] [12]
• Check that the amount is vitamin B6. If a form is listed by name with “Daily Value not established” and no vitamin B6 amount, ask the manufacturer or a pharmacist how much vitamin B6 it provides. [9] [12]
• Recalculate the %DV. Divide the milligrams of vitamin B6 by 1.7 and multiply by 100. If the result does not match the label, note the label’s date and ask the manufacturer. [1] [2]
• Work out the concentration. Divide the milligrams of vitamin B6 by the grams of powder in the serving. On the labels above, this ranged from about 0.12 mg to 1,000 mg per gram. [3] [4]
• Do not estimate a weighed serving with a kitchen measure. Two single-ingredient labels above say their contents are sold by weight, not volume, and may settle. [3] [9] If a product can only be measured with a milligram scale, ask a pharmacist whether it is suitable for you at all.
• Add up every product. List each product that contains vitamin B6, including multivitamins, mineral formulas, drink mixes and fortified foods, with the servings you actually use. [7] Upper limits count all sources together. [2]
• Bring the totals to your pharmacist or doctor. ODS lists cycloserine, some antiepileptic medicines and theophylline among medicines that interact with vitamin B6 or affect its levels. [2] DailyMed posts the labeling that companies submit to FDA for medicines and some other products; NLM does not review it before publication. [13]
• Match the record to your container and store it safely. DSLD includes off-market labels, so compare any entry with the label you have. [8] Each single-ingredient label above says to keep the product out of reach of children. [3] [9] [10]

Safety notes

• The TGA says nerve damage from too much vitamin B6 can be severe and irreversible, and advises stopping the product and seeking medical advice if tingling, burning or numbness appears in the hands or feet. [7]
• ODS says taking high amounts of vitamin B6 from supplements for a year or longer can cause severe nerve damage. [5] It also lists painful skin lesions, sensitivity to sunlight, nausea and heartburn among the effects of excessive intake. [2]
• One labeled serving of labels A or C (41 to 50 mg) is above the Food and Nutrition Board’s upper limits for children aged 1 to 3 and 4 to 8 (30 mg and 40 mg). [2] [3] [10]
• Tell your doctor, pharmacist and other health care providers about every supplement and medicine you take. [5]

Where to go next

Whether you need vitamin B6, and how much, is a question for your doctor or pharmacist. More label guides are listed under Ingredients and labels.

Common questions

Is B6 powder stronger than a B6 tablet?

Not as a rule. Strength is the milligrams of vitamin B6 per labeled serving, whatever the format, and the powders above range from 1.9 mg per drink-mix packet to 50 mg per 50 mg serving. [3] [4] ODS says absorption does not differ substantially among the forms of vitamin B6 in supplements. [2]

What does “as pyridoxine hydrochloride” mean?

It names the source compound that supplies the vitamin. Federal rules allow it in parentheses after “as” or “from”, and the amount listed must be the vitamin itself in one serving. [1]

Why does a P5P powder show no %DV?

On label B, pyridoxal 5-phosphate is listed under its own name and marked “Daily Value not established”. [9] FDA requires that footnote for ingredients without a Daily Value. [12] Label E lists the same form as vitamin B6, with a %DV. [11]

How do I add up vitamin B6 from several products?

Multiply each label’s milligrams per serving by the servings you actually use, then add the results, including drinks and fortified foods. [7] Review the total with your pharmacist or doctor: upper limits count food and supplements together, and they differ between authorities. [2]

Can I measure B6 powder with a spoon?

Two single-ingredient powders above direct users to an accurate milligram scale and say their contents are sold by weight, not volume, and that settling may occur. [3] [9] Ask a pharmacist whether a product that needs that kind of measurement is suitable for you.

If you notice tingling, burning or numbness in your hands or feet while using a product with vitamin B6, stop it and seek medical advice. [7]

Use the ingredient-label checklist

Sources and limitations

1. Electronic Code of Federal Regulations: 21 CFR 101.36, Nutrition labeling of dietary supplements. eCFR text current as of October 8, 2026; paragraphs (b)(2)(ii)(B), (b)(2)(iii)(B) and (C), and (d). Rules for manufacturers; they do not verify any product.
2. NIH Office of Dietary Supplements: Vitamin B6, Fact Sheet for Health Professionals. Updated June 16, 2023. Written for health professionals; its medicine list is examples, not complete, and it reports both the Food and Nutrition Board and EFSA limits.
3. NIH Dietary Supplement Label Database: record 330394, pyridoxine hydrochloride powder. Entered May 21, 2025. Label text as recorded, not a test of contents.
4. NIH Dietary Supplement Label Database: record 293850, electrolyte drink mix. Entered October 24, 2023. Label text as recorded, not a test of contents.
5. NIH Office of Dietary Supplements: Vitamin B6, Fact Sheet for Consumers. Updated June 16, 2023. General consumer overview.
6. Therapeutic Goods Administration (Australia): Health supplements containing vitamin B6 can cause peripheral neuropathy. Describes Australian labeling requirements in force after March 1, 2023; Australian rules, not U.S. ones.
7. Therapeutic Goods Administration (Australia): Are you unknowingly taking too much vitamin B6? Consumer guidance describing products sold in Australia.
8. NIH Office of Dietary Supplements: Dietary Supplement Label Database, About. Records what labels say; it does not test products, and it includes off-market labels.
9. NIH Dietary Supplement Label Database: record 330391, pyridoxal 5-phosphate powder. Entered April 24, 2025. Label text as recorded, not a test of contents.
10. NIH Dietary Supplement Label Database: record 23217, pyridoxine hydrochloride bulk powder. Entered September 25, 2013. An older record; the label in circulation may differ.
11. NIH Dietary Supplement Label Database: record 316647, flavored drink mix. Entered September 25, 2024. Label text as recorded, not a test of contents.
12. U.S. Food and Drug Administration: Dietary Supplement Labeling Guide, Chapter IV. Nutrition Labeling. April 2005; nonbinding recommendations written for manufacturers. Its nutrient-weight example uses calcium, not vitamin B6.
13. National Library of Medicine: DailyMed, About. Labeling is submitted by companies and is not reviewed by NLM before publication.