Kiwi Nutrition Calculator — Green vs. Gold, Vitamin C & Actinidin per Serving

Green kiwi (FDC 168153 — Actinidia deliciosa, Hayward variety) delivers 92.7mg vitamin C per 100g (103% DV) — a single fruit can cover your entire daily vitamin C requirement. This is 74% more vitamin C per gram than oranges (53.2mg) and makes kiwi the highest-vitamin-C common fruit available year-round in most supermarkets ^[1].

Gold kiwi (FDC 174038 — Actinidia chinensis, SunGold variety) pushes even higher: 161.3mg vitamin C per 100g (179% DV) — nearly triple the orange and 74% more than green kiwi itself. One gold kiwi (~69g) delivers 111mg vitamin C (123% DV) from a 43-calorie serving ^[1].

Both varieties have nearly identical calories (61 kcal green vs 63 kcal gold per 100g), but the green variety provides more fiber (3g vs 1.4g) and less sugar (9g vs 12.3g), while gold delivers significantly more vitamin C and folate. The choice depends on whether vitamin C density or fiber content matters more for your tracking goals ^[1].

Kiwifruit contains actinidin (also spelled actinidain), a cysteine protease enzyme that breaks down protein molecules. This enzyme is present in green kiwi at approximately 0.5-0.8mg per gram of fruit and is the reason raw kiwi can tenderize meat and why kiwi-containing gelatin desserts sometimes fail to set (actinidin breaks down gelatin's protein structure) ^[2][3].

Gold kiwi contains significantly less actinidin — roughly one-tenth the concentration of green kiwi. This is why gold kiwi is sweeter and less tangy: the lower enzyme activity means less protein breakdown on the tongue surface (which contributes to the characteristic tingling sensation some people experience with green kiwi) ^[2][3].

Research has studied actinidin's effect on protein digestion in controlled settings and found that kiwifruit consumption alongside protein-rich meals increased gastric protein breakdown in laboratory models. For food journaling, this means kiwi pairs functionally (not just flavor-wise) with high-protein foods — the enzyme actively interacts with the protein during digestion ^[2][3].

The most dramatic green-vs-gold difference beyond vitamin C is vitamin K: green kiwi has 40.3mcg per 100g (34% DV) while gold has just 5.5mcg (5% DV) — a 7x difference. For anyone tracking vitamin K intake, this distinction between varieties is critical and rarely noted on retail labels ^[1].

Fiber: green 3.0g vs gold 1.4g (more than double). Sugar: green 8.99g vs gold 12.3g (gold is 37% sweeter). Calcium: green 34mg vs gold 17mg (double). Iron: green 0.31mg vs gold 0.21mg. Folate: gold 31mcg vs green 25mcg (gold wins here). The two kiwi types are genuinely different foods for detailed nutrient tracking ^[1].

Potassium is essentially identical (312mg green vs 315mg gold per 100g) — both are excellent sources. Two medium kiwis deliver about 430mg potassium (9% DV), comparable to a banana. Vitamin E is also similar (1.46mg green vs 1.4mg gold) — both providing about 10% DV per 100g, unusually high for a fruit ^[1].

While vitamin C gets all the attention, green kiwi's broader micronutrient profile is remarkable. Potassium at 312mg per 100g (7% DV) — higher than bananas (358mg but at 89 kcal, making kiwi more potassium-dense per calorie). Vitamin E at 1.46mg (10% DV) — most fruits have negligible vitamin E (oranges: 0.18mg, apples: 0.18mg) ^[1].

Vitamin K at 40.3mcg (34% DV) makes green kiwi one of the highest vitamin K fruits — only avocado (21mcg) and dried prunes (59.5mcg) come close among commonly eaten fruits. Two kiwis provide 56mcg vitamin K (47% DV), approaching the levels found in leafy greens ^[1].

Folate at 25mcg (6% DV) for green and 31mcg (8% DV) for gold adds to the profile. Combined: per 100g, kiwi delivers meaningful percentages of vitamin C (103%), vitamin K (34%), vitamin E (10%), potassium (7%), and folate (6%) — a micronutrient breadth few fruits match at only 61 calories ^[1].