siggi's Yogurt Nutrition Facts: 17g Protein and No Artificial Sweeteners (All Lines Compared)

siggi's plain nonfat skyr delivers 17g of protein and 100 calories in a single 5.3oz cup, with 5g of naturally occurring milk sugar and no added sweeteners of any kind — making it one of the highest-protein yogurt products on the market at that calorie level. For context: Oikos Triple Zero has 15g at 120 calories; Two Good has 12g at 90 calories; Chobani Zero Sugar has 11g at about 90 calories. siggi’s beats all three on protein density. The brand follows Icelandic skyr tradition: strain the yogurt to concentrate the protein, then sweeten only with cane sugar in flavored varieties — no stevia, no sucralose, no erythritol, no artificial sweeteners of any kind in any product line. Below are the verified nutrition facts for every siggi’s line, a side-by-side competitor comparison, and an honest look at where the brand wins and where it does not. Browse more options in the protein snacks directory or see our dairy-free Greek yogurt guide if you need plant-based alternatives.

siggi’s Nutrition Facts: All Lines Compared

siggi’s sells four main dairy product lines in the US: the original nonfat skyr, the lower sugar line, the 2% milkfat line, and a plant-based line (covered separately). All figures below are for single-serve 5.3oz (150g) cups unless noted and are cross-verified from multiple nutrition databases.

Product	Calories	Protein	Total Sugar	Added Sugar	Fat	Sweetener
Nonfat Plain	100	17g	5g	0g	0g	None
Nonfat Vanilla	110	16g	9g	~7g	0g	Cane sugar
Nonfat Strawberry / Peach / Mixed Berry	120	15g	11g	~9g	0g	Cane sugar
Lower Sugar Vanilla	80	14g	~4g	2g	0g	Organic agave nectar
2% Milkfat Strawberry	140	13g	10g	~8g	2g	Cane sugar

A few patterns worth noting. Plain always has the most protein and fewest calories — this is true across every Greek yogurt and skyr brand, not just siggi’s. The sweet spot for most buyers is the nonfat flavored line: 15–16g of protein for 110–120 calories and about 9–11g of total sugar, which is competitive with the lowest-sugar options in the category. The lower sugar line cuts added sugar to 2g per cup (using a small amount of organic agave nectar) but also trims protein to 14g — still strong, but not the standout that plain is. The 2% line trades protein for richer texture at the cost of roughly 2–4g less protein per cup.

siggi’s Nonfat Skyr: The Standard Line in Detail

The standard nonfat line is what made siggi’s reputation. The skyr-making process strains out roughly two-thirds of the liquid whey, concentrating protein and producing the thick, dense texture that distinguishes siggi’s from conventional yogurt. Per 5.3oz cup:

• Plain: 100 calories, 17g protein, 5g total sugar (0g added), 0g fat. The protein is primarily casein, which digests slowly and supports longer satiety than whey-dominant products.
• Vanilla: 110 calories, 16g protein, 9g total sugar (~7g added cane sugar), 0g fat.
• Strawberry, Peach, Mixed Berry, Raspberry: 120 calories, 15g protein, 11g total sugar (~9g added), 0g fat.

The flavored varieties use real fruit pieces or fruit purée rather than artificial flavoring. The ingredient list for siggi’s Strawberry is genuinely short: cultured skim milk, strawberries, sugar, fruit pectin. That simplicity is part of what differentiates the brand from lower-cost competitors.

siggi’s Lower Sugar Line

The lower sugar cups cut added sugar to 2g per serving by using a small amount of organic agave nectar instead of cane sugar. The trade-off is a modest protein reduction: 14g instead of 15–17g. Per 5.3oz cup:

• Lower Sugar Vanilla: 80 calories, 14g protein, ~4g total sugar (2g added), 0g fat.
• Lower Sugar Peach and Strawberry: similar profile, ~80–90 calories, 14g protein.

This line makes sense for people specifically watching added sugar who find the standard flavored cups too sweet. At 80 calories and 14g protein, the protein-to-calorie ratio is the best in the lineup — 17.5g protein per 100 calories. The slightly lower protein versus plain likely reflects a different straining ratio or formulation for this sub-line.

siggi’s 2% Milkfat Line

The 2% line uses partially skimmed milk rather than fully skimmed milk, adding a richer texture and more fat per serving. Per 5.3oz cup:

• 2% Strawberry: 140 calories, 13g protein, 10g total sugar, 2g fat. The higher fat is where the extra 20–40 calories come from relative to the nonfat line, and protein drops approximately 2–4g versus nonfat equivalents.

Choose this line if texture matters more than maximum protein efficiency. The richer mouthfeel from the milkfat is noticeable, and many people find it more satisfying as a standalone snack than the very firm, dense nonfat version.

siggi’s vs. Oikos, Two Good, and Chobani Zero Sugar

The low-added-sugar yogurt segment has several major players. Here is how siggi’s measures up on the numbers that matter most: protein, total sugar, calories, and sweeteners used.

Brand / Product	Calories	Protein	Total Sugar	Added Sugar	Sweeteners Used
siggi’s Nonfat Plain (5.3oz)	100	17g	5g	0g	None
siggi’s Nonfat Vanilla (5.3oz)	110	16g	9g	~7g	Cane sugar only
Oikos Triple Zero Vanilla (5.3oz)	120	15g	6g	0g	Stevia, sucralose
Two Good Vanilla (5.3oz)	90	12g	2g	0g	Allulose, stevia
Chobani Zero Sugar Vanilla (5.3oz)	~90	11g	0g	0g	Allulose, stevia

The pattern is clear. Brands that reach zero or near-zero added sugar do so with non-nutritive sweeteners — stevia, sucralose, allulose. siggi’s is the only mainstream brand that sweetens only with cane sugar (flavored lines) or uses no sweetener at all (plain). This means siggi’s flavored cups carry real added sugar (~7–9g per cup), which puts them in a different category from Oikos Triple Zero or Two Good on the sugar column. But the protein advantage is real: siggi’s plain at 17g beats every comparable product at a similar calorie level, and flavored siggi’s (15–16g) beats Two Good (12g) and Chobani Zero Sugar (11g) by a meaningful margin.

The right choice depends on your priority. If maximum protein and no artificial sweeteners is the goal, siggi’s plain is unmatched. If you want a sweet flavored cup with near-zero sugar and don’t mind stevia or sucralose, Oikos Triple Zero or Two Good are the better fit. If you want flavored yogurt with no artificial sweeteners, siggi’s flavored is the only mainstream option.

Does siggi’s Use Artificial Sweeteners?

No — and this is worth stating explicitly because it is a genuine differentiator in a category where most low-sugar products rely on non-nutritive sweeteners. siggi’s uses no artificial sweeteners and no non-nutritive sweeteners — no stevia, no sucralose, no erythritol, no allulose, no monk fruit, no aspartame — in any dairy product. Plain cups use zero added sweetener. Flavored cups use cane sugar (standard line) or organic agave nectar (lower sugar line) as the only sweeteners. This is verifiable on every label and confirmed by the brand’s publicly stated formulation philosophy.

This matters for several reasons. Some people notice a metallic aftertaste or bitterness from stevia and sucralose; siggi’s eliminates that. There is ongoing research into whether high-dose non-nutritive sweeteners affect gut microbiome composition; siggi’s sidesteps that concern entirely. And the brand’s commitment to short ingredient lists was part of its founding philosophy: the founder specifically objected to the artificial-sweetener-heavy US yogurt market when he created siggi’s in 2004, modeled on Icelandic skyr tradition.

Frequently Asked Questions

How much protein is in siggi’s yogurt?

siggi’s nonfat plain skyr has 17g of protein per 5.3oz cup. Nonfat flavored varieties (vanilla, strawberry, peach) have 15–16g per cup. The lower sugar line has 14g per cup, and the 2% milkfat line has approximately 13g. Plain siggi’s delivers more protein per serving than Oikos Triple Zero (15g), Two Good (12g), or Chobani Zero Sugar (11g).

Is siggi’s yogurt healthy?

For most goals, yes. Plain siggi’s is 100 calories, 17g protein, 0g fat, and 5g of naturally occurring milk sugar with no added sweeteners — a nutritionally clean, high-protein choice. The flavored lines add 7–9g of cane sugar per cup, which is moderate for a flavored dairy product. The main trade-off for flavored cups versus zero-sugar competitors is that real cane sugar adds calories and carbohydrates that non-nutritive sweeteners do not.

Is siggi’s better than Greek yogurt?

siggi’s is technically skyr (an Icelandic cultured dairy product), not Greek yogurt, though the manufacturing process is similar — both are strained to concentrate protein. In practice, siggi’s nonfat plain tends to run higher protein (17g) than most conventional Greek yogurt brands at an equivalent calorie level. The texture is firmer and denser than most Greek yogurts of the same serving size.

Does siggi’s use stevia or other sweeteners?

No. siggi’s uses no artificial sweeteners, stevia, sucralose, allulose, erythritol, or monk fruit in any dairy product. Plain cups use no sweetener. Flavored cups use cane sugar (standard line) or organic agave nectar (lower sugar line) only. This sets siggi’s apart from competitors like Oikos Triple Zero, Two Good, and Chobani Zero Sugar, which all use stevia and/or allulose to reach near-zero sugar.

How does siggi’s compare to Chobani?

siggi’s plain nonfat has more protein (17g vs ~14g for Chobani plain nonfat) and fewer calories (100 vs ~120 for Chobani plain nonfat). For flavored cups, siggi’s standard line uses only cane sugar while many Chobani flavored products use added sweeteners or fruit syrups. Chobani Zero Sugar (11g protein, 0g total sugar) is the low-sugar Chobani option but uses stevia and allulose, which siggi’s does not use in any product.

Bottom line: siggi’s plain nonfat skyr is one of the most protein-dense yogurt options available — 17g for 100 calories — with no artificial sweeteners in any line. The flavored versions carry real cane sugar (not a dealbreaker, but worth knowing). If you want maximum protein without sweetener trade-offs and can work with a mildly tart, dense texture, siggi’s plain is the strongest choice in the category. Browse more high-protein dairy options in the protein snacks directory.