Snus pH and why it changes the nicotine hit

Snus is deliberately made alkaline, and pH decides what fraction of its nicotine is in the free-base form your gum can absorb. Two reputable laboratories put Swedish snus at an average pH of 7.93 and 8.5 respectively — a gap created by their own measuring protocols. And nobody has ever actually measured free-base nicotine in snus: every published figure is arithmetic from pH.

The alkalinity story is usually told as though the industry raises pH to boost the hit. The manufacturer’s own account says the opposite happened: the target pH was deliberately lowered in the 1970s, on oral-health grounds, and it is lower now than it used to be. That is the first thing to get straight.

This page is about snus specifically. For tobacco-free pouches, which have their own measurements and a much wider pH range, see pouch pH and why it changes the hit. For the water content that moves pH around, snus moisture levels.

The mechanism, in the regulator’s own words

Nicotine is a weak base. In acid it carries a proton and is poorly absorbed across mucous membranes; in alkali it sheds that proton and crosses readily. FDA’s Office of Science set this out in a 2016 internal memorandum:

Free-base nicotine is readily absorbed through the oral mucosa and any free-base nicotine that does not have ready access to the mucosa may be swallowed and absorbed through the gastrointestinal (GI) tract.

The conversion point is the acid dissociation constant: The conversion of mono-protonated nicotine to the free-base form occurs at the pKa of about 8.02. Which is worth one sentence of scepticism. The reference FDA cites for that number is the CRC Handbook of Chemistry and Physics, 71st edition, 1990 — a general chemistry reference, not a measurement in tobacco or in saliva. The entire free-base arithmetic in this field rests on a handbook value.

FDA also warns against taking the arithmetic too seriously, in the same document:

However, the HHE does not fully describe the rate of release from a complex tobacco product.

HHE is the Henderson-Hasselbalch equation — FDA’s own document spells it “Hasselbach”. Hold on to that caveat; it turns out to be the most important sentence on this page.

What has actually been measured: the CDC survey

The independent dataset is a 2020 analysis by scientists at the Centers for Disease Control and Prevention, covering 64 snus products made by ten manufacturers in Northern Europe (n = 56) and the United States (n = 8). Its funding statement reads The authors have no support or funding to report. and its competing interests are declared as none — a rarity in this literature.

The headline: pH, 5.87 to 9.10 corresponding to 0.71% and 92.3% unprotonated nicotine, respectively. Across sixty-four products of the same general type, the absorbable fraction of the nicotine runs from under one per cent to over ninety.

Category	n	Mean pH	pH range	Unprotonated nicotine, mean
Northern European portion, all	49	8.08	6.94–9.10	55.0%
of which “strong”	16	8.18	7.88–8.65	60.1%
of which white portion	28	8.09	6.94–9.10	55.8%
of which original portion	21	8.07	7.12–8.92	54.2%
Northern European loose	7	7.63	7.19–8.18	32.7%
Northern European, all	56	7.93	6.94–9.10	47.5%
US-made snus	8	6.62	5.87–7.66	11.2%

Two findings in that table deserve pulling out. The LS-mean pH for NE snus was 7.93 (SE = 0.236) and significantly higher compared to pH 6.62 (SE = 0.366) for US snus — the American-made products called snus are a different animal chemically, and most of their nicotine stays locked in the protonated form. And for the question people ask most often about Swedish products: there were no detectable differences in moisture, pH, and nicotine concentrations between NE white and original portion categories. White portion is not a lower-pH product. For what does separate them, see white portion vs original portion.

The protocol matters, so here it is: The pH values were determined in a 1-g sample of each product in a 10-mL aliquot of distilled, deionized water using a Sirius Vinotrate pH meter, with Measurements for pH at 5-, 15-, 30-, and 60-min intervals were averaged.

And the other big survey disagrees — because it measures differently

The same year, a 70-product survey funded by British American Tobacco reported Swedish snus a good half-unit higher:

The L and P snus products were basic, and had the highest pHs (average 8.5, range 7.5–9.4), with no differences on average between the loose and pouch products

Note the clause at the end. CDC found loose snus significantly lower than portion — 7.63 against 8.08, p = 0.0042. This survey found no difference at all. The BAT paper also puts American moist snuff at the two HP products (7.9–8.1) and MS (7.8, range 6.4–8.4), had similar albeit slightly lower average pH values — far higher than CDC’s figure for American snus, though these are different product categories.

Its disclosure is extensive and should be read: The study was funded by British American Tobacco (BAT). At the time of the study KM, HK and AF were paid employees of BAT. AP is a paid consultant to BAT.

I do not think either laboratory is wrong. I think they are measuring different things and calling them the same thing. Their protocols trace back through a three-paper citation chain to an acrylamide study, where the method finally appears: 1.0 ± 0.05 g of ground STP into A 50 mL aliquot of deionised water, shaken for thirty minutes, and then The pH of the decanted extract was measured using a GL pH automated pH meter.

	CDC, 2020	BAT-funded survey, 2020
Sample	1 g, as sold	1.0 ± 0.05 g, ground in a 1 mm mill
Water	10 mL (1:10)	50 mL (1:50)
Agitation	not stated	shaken 30 min at 180 rev/min
Reading	averaged over 5, 15, 30 and 60 minutes	decanted extract, single reading
Swedish / Northern European snus	mean 7.93, range 6.94–9.10	mean 8.5, range 7.5–9.4

At a pKa of 8.02, 7.93 works out at roughly 46% free base and 8.5 at roughly 76% — that arithmetic is mine, not either paper’s. Which is to say the gap between two honest laboratories is larger than most of the differences anyone argues about between products. No published study has measured the same snus by both protocols, so I cannot tell you which number is closer to what happens in a mouth.

Nobody has ever measured free-base nicotine in snus

This is the finding I did not expect, and it changes how every percentage on this page should be read. In both surveys, the free-base fraction is computed, not assayed. CDC: Unprotonated nicotine concentrations, calculated using pH and total nicotine concentrations, varied widely among all products. BAT: The pH values were used to estimate the levels of unprotonated (free) nicotine in the products using the Henderson-Hasselbalch approximation.

Worse, neither paper prints the pKa it used. I searched the CDC paper for “pKa” and for “Hasselbalch” and found neither, in a paper that publishes unprotonated-nicotine percentages to three significant figures. The BAT survey names the equation and cites a 1995 paper for it without giving a number.

So “92.3% unprotonated” is not a measurement of a chemical species. It is a pH reading pushed through an equation whose constant comes from a chemistry handbook, by an author who did not say which constant they used, applied to a product that FDA’s own scientists say the equation does not fully describe. The direction of the finding is solid — alkaline snus delivers more nicotine than acidic snus, and that has been shown in people. The decimal places are decoration. For the underlying chemistry, see nicotine salts vs freebase nicotine.

Why the carbonate is there — and why pH came down, not up

Swedish Match’s own history of the product is the most interesting document in this area, and it inverts the expected narrative. The additive doing the work is sodium carbonate, and its job is described as stabilisation rather than elevation: Sodium carbonate helps to stabilize the pH. with a stated target — The target pH level in the production of most traditional snus brands is about 8.5 with some batch to batch variation due to natural variation of the raw tobacco.

Then:

Before the 1970s the pH of snus was typically higher, but with the introduction of new production technique, the target pH level was intentionally reduced as a result of research on “snus lesions” in the gingival and buccal mucosa which were found to be related to pH level

The company’s stated reasoning at the time: Abrasions of the buccal mucosa were at the time hypothesized to increase the absorption of potential toxicants. The word is theirs, and it is “hypothesized” — a historical rationale, not a settled finding. But the direction is unambiguous. The alkalinity you encounter in a modern tin is lower than the alkalinity of fifty years ago, by design.

And the original reason for a buffer was not the hit at all. It was instability, in both directions: This open manufacture was also sensitive to contamination with moulds, particularly if pH was below c. 8. at one end, and ammonia formation pushing pH up unpredictably at the other. The carbonate is a brake on drift.

One small detail nobody else prints: Traditionally potassium carbonate was used instead of sodium carbonate. The switch was made for technical reasons: sodium carbonate is more water soluble and using a water solution facilitates the production. A manufacturing convenience, not a formulation philosophy.

It is also worth knowing that pH does not hold still on the shelf. The same paper carries a figure captioned Natural decline of pH in snus (pouch products) manufactured according to the GothiaTek standard during storage — the numbers exist only inside the image, so I can report the direction and not a slope. Ageing drops water and pH together, which ties directly to how to read a snus can’s dates.

Does it change the hit in people? One clean experiment, and it is not snus

The pH-versus-delivery question has been settled experimentally in humans — in American moist snuff. Wilhelm and colleagues took one commercial product and chemically amended it:

This was the first study to compare nicotine pharmacokinetics (PK) and pharmacodynamics (PD) after the use of commercial smokeless tobacco products that were experimentally manipulated to differ only in pH and percent free-base nicotine.

Forty moist-snuff users used a single 2 g portion of Copenhagen Original Long Cut amended to 4 pH levels: 5.0, 7.7, 8.2, and 8.6 (free-base nicotine 0.1, 32, 60, and 79%) for 30 minutes. The result was more than 4-fold increases in mean plasma nicotine maximum concentration and area under the curve over 240 minutes (3.9 to 16.7 ng/mL.

Four-fold, from pH alone, with everything else held constant. That is as clean as this field gets. The honest framing is that its top arm — pH 8.6, 79% free base — sits inside the range Swedish snus actually occupies, so the mechanism is demonstrated in a smokeless tobacco at pH values snus reaches. It has not been demonstrated in snus. I could not establish the study’s funding statement; two of its authors are affiliated to FDA’s Center for Tobacco Products.

There is one snus experiment, from 2003, and it is small and old. Twenty habitual loose-snuff users were studied during use of their usual brand, after 12 weeks use of a snuff with lower pH and after another 12 weeks use of a snuff with both lower pH and lower nicotine concentration. The reported reduction in daily nicotine intake came in the arm where both were lowered; the abstract says nothing about the lower-pH-only arm, and the full text is not available anywhere I can reach. Its conclusion on the mucosa points at nicotine first: However, there also seems to be a synergistic effect between the pH and nicotine concentration in the snuff. I would not build an argument on it in either direction.

What has not been done is the obvious modern study: no snus pharmacokinetic trial has deliberately varied pH. Every one holds pH roughly flat and varies dose, mass or format.

Three studies that point away from pH

Which brings the counterweight, and it is substantial. The best snus pharmacokinetic dataset — a six-way crossover in twenty users, funded by British American Tobacco — kept pH between 7.9 and 8.3 across all four snus arms while varying nicotine content two-and-a-half-fold, and concluded:

The similar nicotine absorption for 1 g portions of loose and pouched snus with approximately 11 mg of nicotine indicate that absorption kinetics were dependent on quantity of tobacco by weight and total nicotine content rather than product form.

Median time to peak was 1.00 hour in every snus arm, regardless of dose or format. At constant pH, dose moves the peak height and not its timing.

The same group’s extraction study, also BAT-funded (All authors are employees of British American Tobacco, which is a producer of snus), found the dominant variance was not in the product: Generally, less than a third of each constituent tested was extracted during one hour of snus use, independent of constituent concentration. and The variable nature of in-use extraction was shown to be driven by inter-subject variability.

And CDC’s own surveillance of American moist snuff, looking for what correlates with absorbable nicotine, named something else entirely: Product characteristics such as packaging and moisture content appeared to be correlated with concentrations of un-ionized nicotine, across brands that varied widely in content of rapidly absorbed, addictive un-ionized nicotine (500-fold range).

Both halves of this are true and the article should hold them together: isolate pH and it is a powerful lever; look at real products used by real people and it is one factor among several, with the user the biggest variance term of all. If you want the practical version of that, it is in nicotine delivery vs nicotine content.

Saliva does not neutralise it

A reasonable objection: your saliva is roughly neutral and there is a lot of it, so why does the carbonate not simply get buffered away? Somebody measured. In a one-hour use study:

Mean sample pH fell marginally from 8.2 to 8.0, most probably because of increased saliva levels and salivary pH, which ranges from approximately 6.5 – 7.5

Two tenths of a unit, over a full hour — which on the standard arithmetic takes the free-base fraction from about 60% to about 49% (again, my arithmetic). The portion takes on a great deal of water during use and still holds most of its own pH. It is a buffered mass, not a dissolving one. The pH of your mouth also goes up while snus is in it, per the 2003 study.

Nobody regulates snus pH, in either direction

Sweden regulates snus as a food rather than as a tobacco product, and the current instrument is the Swedish Food Agency’s LIVSFS 2024:2, decided 16 February 2024. I searched its full text for “pH” and found zero occurrences.

That absence is more pointed than it sounds, because the same regulation is perfectly willing to set numbers. Section 8 provides that snus, snus-like products and chewing tobacco may not contain bly i mängder över 3 mg/kg — lead above 3 mg/kg — with aflatoxins capped at 0,005 mg/kg, benzo(a)pyrene at 0,003 mg/kg dry weight, and Snus och tuggtobak får inte heller innehålla tobaksspecifika nitrosaminer NNN och NNK (summan) i mängder över 2 mg/kg torrvikt. The regulator plainly knows how to write a numeric limit for snus. It has not written one for pH.

Its annex is pH-agnostic in both directions. Only the additives it lists may be used — Endast de livsmedelstillsatser som anges i bilagan till dessa föreskrifter får ingå i snus och tuggtobak. — and the list includes E 500 sodium carbonates, E 501 potassium carbonates, E 503 ammonium carbonates and E 170 calcium carbonate, alongside acidifiers including lactic, malic, acetic and hydrochloric acid. All of them under the annex’s default condition: Om ingen maximihalt anges nedan får livsmedelstillsatserna användas enligt quantum satis-principen — where no maximum is stated, as much as is needed. Potassium sorbate, by contrast, is capped at 2 g/kg. The alkali is uncapped on purpose.

Sweden’s tobacco statute, Lag (2018:2088), likewise contains no pH provision; I checked case-sensitively, because the Swedish words upphävande and upphettade produce a dozen false positives on a careless search.

The American position is the inverse and just as striking. The statutory reporting duty for smokeless tobacco, 15 U.S.C. § 4403, requires manufacturers to provide a list of the ingredients added to tobacco in the manufacture of smokeless tobacco products and a specification of the quantity of nicotine contained in each such product. No pH, no moisture, no unprotonated nicotine — those are reported under the agency’s practice, not under the statute’s text.

FDA does require pH, though, in product-review submissions. Its guidance on smokeless tobacco notes that ingredients such as sodium carbonate, potassium acetate, and ammonia can influence the pH of a smokeless tobacco product, and a change in pH can impact the amount of free nicotine released from the tobacco product. and directs that You should provide the pH of the new and predicate tobacco products and quantify the total and free nicotine quantities in the new and predicate tobacco products. It also requires pH as a stability endpoint, measured at the beginning, middle and end of the product’s expected storage time — which is the industry’s own “natural decline of pH” phenomenon turned into a regulatory obligation.

And in all of that, no threshold. No cap, no floor, no target value. FDA requires pH to be measured, compared and tracked, and sets no number. For the wider picture, our regulation tracker covers the jurisdictions.

Frequently asked questions

What is the pH of snus? Depending on which laboratory you ask, Swedish and Northern European snus averages 7.93 or 8.5, with measured individual products running from 6.94 to 9.4. American-made snus is much lower — a mean of 6.62 in CDC’s survey. The spread between laboratories comes from their extraction protocols, which differ by a factor of five in dilution.

Does higher pH mean a stronger hit? In the one experiment that isolated pH, yes and dramatically — a four-fold increase in peak plasma nicotine from pH 5.0 to 8.6 in American moist snuff. But in real products used normally, three separate studies found mass, nicotine content, moisture, packaging and differences between individual users doing more of the work than pH.

Is white portion snus less alkaline? No. CDC found no detectable difference in pH, moisture or nicotine between white and original portion categories.

Why does snus contain sodium carbonate? Per the manufacturer, to stabilise pH against drift — moulds grow below about pH 8 and ammonia formation used to push it up unpredictably — with a stated target of about 8.5. It is also a declared aroma ingredient.

Has snus got weaker over time? On pH, yes, deliberately: Swedish Match states the target was intentionally reduced from a higher pre-1970s level following research on mucosal lesions. A separate 1999 review describes a decline from a previous range of 8-9 to a range of 7.8-8.5, though it cites no measurement for it.

Does saliva cancel out the alkalinity? Barely. Over an hour of use, measured pouch pH fell from 8.2 to 8.0.

Can I find out my brand’s pH? Not from the can. No jurisdiction requires snus pH to be declared, and in Sweden real snus is not even required to carry an ingredient list — only net weight, manufacturing date, storage instructions and the maker’s name.

Sources

• Lawler TS, Stanfill SB, Tran H, et al. “Chemical analysis of snus products from the United States and northern Europe.” PLoS ONE 2020. PMC6961908. Centers for Disease Control and Prevention; no support or funding to report, no competing interests declared.
• Chen L, McAdam K, Kimpton H, Porter A, Rodu B. “The composition of contemporary American and Swedish smokeless tobacco products.” BMC Chemistry 2019;13:59. PMC6661804. Funded by British American Tobacco; three authors BAT employees, one a paid BAT consultant.
• McAdam K, Kimpton H, Vas C, Rushforth D, Porter A, Rodu B. “The acrylamide content of smokeless tobacco products.” Chemistry Central Journal 2015;9:56. PMC4602115 — the source of the pH protocol used in the survey above. BAT-funded.
• Rutqvist LE, Curvall M, Hassler T, Ringberger T, Wahlberg I. “Swedish snus and the GothiaTek standard.” Harm Reduction Journal 2011;8:11. PMC3119032. All authors are or have been employees of Swedish Match AB; no funding statement.
• Wilhelm J, Mishina E, Viray L, Paredes A, Pickworth WB. “The pH of Smokeless Tobacco Determines Nicotine Buccal Absorption: Results of a Randomized Crossover Trial.” Clinical Pharmacology & Therapeutics 2022;111(5):1066–1074. PMID 34826137. Funding statement not established; two authors affiliated to FDA’s Center for Tobacco Products.
• Andersson G, Warfvinge G. “The influence of pH and nicotine concentration in oral moist snuff on mucosal changes and salivary pH in Swedish snuff users.” Swedish Dental Journal 2003;27:67–75. PMID 12856395. Abstract only; full text not reachable.
• Digard H, Proctor C, Kulasekaran A, Malmqvist U, Richter A. “Determination of nicotine absorption from multiple tobacco products and nicotine gum.” Nicotine & Tobacco Research 2013. PMC3524070. Funded by British American Tobacco (Investments) Ltd.
• Digard H, Gale N, Errington G, Peters N, McAdam K. “Multi-analyte approach for determining the extraction of tobacco constituents from pouched snus by consumers during use.” Chemistry Central Journal 2013;7:55. PMC3618139. All authors BAT employees.
• Lunell E, Fagerström K, Hughes J, Pendrill R. “Pharmacokinetic Comparison of a Novel Non-tobacco-Based Nicotine Pouch (ZYN) With Conventional, Tobacco-Based Swedish Snus and American Moist Snuff.” Nicotine & Tobacco Research 2021. PMID 32319528. Funding not established.
• Richter P, Hodge K, Stanfill S, Zhang L, Watson C. “Surveillance of moist snuff: total nicotine, moisture, pH, un-ionized nicotine, and tobacco-specific nitrosamines.” Nicotine & Tobacco Research. PMID 18988077. Centers for Disease Control and Prevention.
• US Food and Drug Administration, Center for Tobacco Products, Office of Science memorandum, fda.gov/media/124673, signed 2 May 2016.
• US Food and Drug Administration, Information to Consider for Smokeless Tobacco Products (appendix), version 10/2/18, fda.gov/media/122919.
• 15 U.S.C. § 4403, Comprehensive Smokeless Tobacco Health Education Act ingredient reporting. Legal Information Institute text.
• Livsmedelsverket, LIVSFS 2024:2, Livsmedelsverkets föreskrifter om snus, snusliknande produkter och tuggtobak, decided 16 February 2024. Official PDF.
• Lag (2018:2088) om tobak och liknande produkter, as amended through SFS 2024:888. Riksdag text.

Every quotation on this page was checked character by character against the publisher’s, agency’s or parliament’s own copy of the document on 2 November 2026. The two absences — no pH provision in either Swedish instrument, and no stated pKa in either survey — were confirmed by searching the downloaded texts, not inferred. Where a free-base percentage is my own arithmetic rather than a published figure, I have said so.

Nicotine is addictive. No tobacco or nicotine product is safe, and completely stopping is the lowest-risk option. This site is for adults who already use nicotine — 21+ in the United States, 18+ or your local legal age elsewhere. Nothing here is medical advice.