Ingredients and labels

Freeze Dried Spinach Powder: Process, Serving Size, Nutrient Data and Storage

Freeze dried spinach powder explained: how freeze-drying works, what a label serving means, nutrient-data limits, storage and five real labels compared.

By Cardio Guardian Editorial TeamPublished October 15, 202612 min read

Freeze dried spinach powder is spinach that has been frozen, dried while its water stays frozen, and then ground. Raw spinach is mostly water, so the powder holds spinach solids in a much smaller weight, but how much of any nutrient it contains depends on the spinach, the process, the storage and the label, not on the word “freeze-dried”. USDA’s FoodData Central (FDC) lists 91.4 g of water in 100 g of raw spinach, and it has no entry for dried, freeze-dried or powdered spinach. [1] Freeze-drying runs through freezing, primary drying and secondary drying, and it costs more energy than hot-air drying. [2] [3]

This page is general education about an ingredient and its labels. It does not recommend any product or amount, and the label records below are examples, not endorsements.

Safety first: if you take warfarin or another blood thinner, have kidney disease or take a medicine that can raise potassium (such as an ACE inhibitor or a potassium-sparing diuretic), have had calcium oxalate kidney stones, or are pregnant or nursing, ask your doctor or pharmacist before using spinach powder products. NIH’s Office of Dietary Supplements (ODS) lists spinach among the green leafy vegetables that provide vitamin K and says people who take warfarin should keep the amount of vitamin K from food and supplements about the same every day. [4] Warfarin prescribing information tells patients to avoid drastic changes in dietary habits, such as eating large amounts of leafy, green vegetables. [5] ODS also lists spinach as a potassium source and says people with chronic kidney disease and those who use certain medicines can develop high blood potassium even from typical amounts of food. [6] The National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) lists spinach among the foods that people who have had calcium oxalate stones may want to avoid. [7] ODS says many supplements have not been well tested in women who are pregnant or nursing. [8]

Use the ingredient-label checklist

How freeze-drying works

A 2026 review of freeze-drying, also called lyophilization, describes its stages as pretreatment, freezing, primary drying, secondary drying and storage, and says product quality depends on the raw material, pretreatment, chamber pressure, shelf temperature and freezing rate. [2] A 2020 review of plant-based foods says the water stays solid during freeze-drying, which protects the structure and shape of the food with minimal volume reduction, and that the lower process temperatures allow maximal nutrient retention; it also says freeze-drying needs four to ten times more energy than regular hot-air drying and is the most expensive way to make a dehydrated product. [3]

Neither review tested spinach powder. “Freeze-dried” on a package describes the drying method the maker chose, and “powder” describes the texture; neither word says whether the starting material was whole leaves, juice or an extract. For supplements, a botanical ingredient must be followed by the part of the plant it comes from, such as leaves. [9]

What a serving size on the label means

A serving size is a labeling unit, not a personal recommendation. On a Supplement Facts panel, the serving size is set under federal rules that use the maximum amount recommended on the label per eating occasion. [10] [11] On a Nutrition Facts panel, it is based on reference amounts that FDA lists by food type: 5 g for dried vegetables, and 4 g for vegetables used mainly for garnish or flavor, such as dried parsley. [11] Which reference amount a maker uses depends on how the product is made and sold.

Real labels differ widely. The two single-ingredient spinach food records in FDC list a 10 g serving for a whole food powder and a 5 g serving for dehydrated flakes, while each of the five supplement label records below lists 1,000 mg (1 g) of its spinach ingredient per labeled serving, so the largest serving here is 10 times the smallest (our calculation). [1] [12] [13] [14] [15] [16] For practice comparing serving sizes and the panel underneath them, see the food label reading worksheet.

Hypothetical example. Using FDC’s raw spinach entry, 10 g of fully dried whole spinach holds about the solids of 116 g of raw spinach (our calculation). [1] That is a weight comparison only. ODS says supplements can’t take the place of the variety of foods that are important to a healthy eating routine. [8]

What nutrient data can and cannot tell you

The first table shows two FDC entries for raw spinach and scales each to a fully dry basis, as if every gram of water were removed. It is a composition example, not a measurement of any powder.

Raw spinach per 100 g in two USDA FoodData Central entries, and the same values on a fully dry basis
Per 100 g	Spinach, raw (FDC 168462)	Spinach, mature (FDC 1999633)	FDC 168462, fully dry basis (our calculation)	FDC 1999633, fully dry basis (our calculation)
Water	91.4 g	92.4 g	0 g	0 g
Solids (100 g minus water)	8.6 g	7.6 g	100 g	100 g
Protein	2.86 g	2.91 g	33.3 g	38.3 g
Dietary fiber	2.2 g	1.59 g	25.6 g	20.9 g
Calcium	99 mg	66.6 mg	1,151 mg	876 mg
Iron	2.71 mg	1.05 mg	31.5 mg	13.8 mg
Sodium	79 mg	107 mg	919 mg	1,408 mg
Potassium	558 mg	460 mg	6,488 mg	6,053 mg
Vitamin C	28.1 mg	30.3 mg	327 mg	399 mg
Folate	194 mcg	113 mcg	2,256 mcg	1,487 mcg
Vitamin K	483 mcg	No value listed	5,616 mcg	No value listed

Raw spinach itself varies. The two entries come from different samples and data types. In the older SR Legacy entry, water, fiber and vitamin K each rest on one data point; the newer Foundation entry averages eight analyzed samples for most values, with iron ranging from 0.63 to 1.62 mg, potassium from 320 to 644 mg and sodium from 0 to 182 mg per 100 g, and it lists no vitamin K value. [1] Iron in the two entries differs by a factor of about 2.6 (our calculation).

Why a real powder will not match the fully dry columns. The scaling assumes all water is gone and nothing else is lost. Dried foods can reabsorb moisture, and in a laboratory study of stored spinach juice powder, beta-carotene, lutein and alpha-tocopherol fell over time. [17] [18] A juice powder or an extract is also a different ingredient from ground whole leaves. Use the panel on your own package.

The second table shows what two single-ingredient spinach food labels declare, as converted to 100 g by FDC. Neither ingredient list says freeze-dried.

What two spinach food labels declare, per 100 g as converted in FDC Branded Foods
Per 100 g	Whole food powder, “100% organic spinach” (FDC 2408737)	Dehydrated flakes, “dehydrated spinach” (FDC 2096441)
Serving size on the label	10 g	5 g
Protein	28 g	40 g
Dietary fiber	14 g	20 g
Calcium	1,100 mg	1,200 mg
Iron	30.06 mg	28.8 mg
Sodium	1,500 mg	900 mg
Potassium	No value in the record	No value in the record
Vitamin C	No value in the record	300 mg
Vitamin K	No value in the record	No value in the record

Small servings magnify rounding. FDC converts label values to a 100 g basis and notes that label rounding can make these values differ from laboratory measurements, especially for foods with small serving sizes. [19] With a 5 g serving, each 1 g shown on the label becomes 20 g per 100 g, and with a 10 g serving it becomes 10 g (our calculation). The FDC records for these two products were published in December 2022 and October 2021, and the labels in circulation may have changed. [1]

A missing value is not a zero. FDC says a missing nutrient value does not indicate zero. [19] Current Nutrition Facts rules require vitamin D, calcium, iron and potassium; other vitamins and minerals, such as vitamin K and folate, are optional unless they are added or a claim is made about them. [20] Neither record lists potassium or vitamin K, and none of the five supplement records below declares any nutrient amount. [1] [12] [13] [14] [15] [16]

Hypothetical example. On the fully dry basis of FDC’s raw spinach entry, 1 g of whole spinach solids would hold about 56 mcg of vitamin K (our calculation), and that entry’s vitamin K value rests on one data point. [1] For comparison, the reference intake FDA uses for vitamin K on labels for adults is 120 mcg. [20] Processing, storage and the type of ingredient would change the real amount, and a label will rarely tell you. If you take warfarin, ask your pharmacist how a spinach product fits with keeping your vitamin K intake consistent. [4]

Five spinach labels compared

Method. The table uses five on-market records from the NIH Dietary Supplement Label Database (DSLD), which records the information printed on supplement labels sold in the United States, including products that are no longer sold. [21] Each record names its spinach ingredient differently; together they are examples, not a representative sample or a ranking, and each is identified by its DSLD record number only. A record shows what a label declares per labeled serving, not what a product has been tested to contain.

Five spinach ingredients as recorded in DSLD
Label	Ingredient name as recorded, and form	Amount per labeled serving and record date	What the record says about drying, plant part and other ingredients
A: DSLD 290306 [12]	“Spinach, Powder”; powder	1,000 mg; no nutrient amounts declared; entered 2023	No drying method, plant part or other ingredients shown
B: DSLD 290337 [13]	“Spinach Juice, Powder”; powder	1,000 mg; no nutrient amounts declared; entered 2023	Made from spinach juice; no drying method, plant part or other ingredients shown
C: DSLD 290529 [14]	“Spinach Extract, Powder”, noted as a 4:1 extract; powder	1,000 mg; no nutrient amounts declared; entered 2023	Does not say what the 4:1 ratio is measured against; no drying method, plant part or other ingredients shown
D: DSLD 311638 [15]	“Spinach extract”; powder	1,000 mg; no nutrient amounts declared; entered 2024	No extract ratio, drying method, plant part or other ingredients shown
E: DSLD 330851 [16]	“Spinach Whole Herb Extract”, noted as 20:1; powder	1,000 mg; no nutrient amounts declared; entered 2025	“Whole herb” is the only plant-part wording; does not say what the 20:1 ratio is measured against; no drying method or other ingredients shown

No record says freeze-dried. None of the five records names a drying method, so a powder’s drying method is known only if its own label states it. [12] [13] [14] [15] [16]

A weight is not a nutrient amount. Each record declares 1,000 mg of a spinach ingredient and no vitamins or minerals, so the label shows how much spinach material is in a serving, not how much vitamin K, potassium or folate it holds. [12] [13] [14] [15] [16]

Juice and extracts are different ingredients. Label B is made from juice and labels C, D and E are extracts, so none is the same as ground whole dried spinach, which is what the fully dry columns above describe. [13] [14] [15] [16] [1] Labels C and E state ratios, 4:1 and 20:1, without saying what they compare. [14] [16]

Part of the plant. Supplement rules call for the plant part after a botanical ingredient name. [9] Only label E’s record carries plant-part wording, “whole herb”; the records for labels A to D show none, so check the physical label or ask the manufacturer. [16] [12] [13] [14] [15] Supplements do not need FDA approval before they are sold, and FDA does not determine whether they are effective before they are marketed. [8]

How to store spinach powder

The National Center for Home Food Preservation says dried foods are susceptible to insect contamination and moisture reabsorption, and that foods packaged seemingly “bone dry” can spoil if moisture is reabsorbed. It recommends clean, dry containers such as canning jars, freezer containers with tight-fitting lids or freezer bags, stored in cool, dry, dark areas, and packing amounts that can be used at once, because each opening exposes the food to air and moisture. It gives 4 months to 1 year as recommended storage times, says vegetables have about half the shelf-life of fruits, and says moldy foods should be discarded. [17] Its guidance is written for home-dried foods.

In the laboratory storage study, spray-dried spinach juice powder made without an added carrier lost beta-carotene faster than lutein or alpha-tocopherol; at 4 °C without vacuum, the half-life of beta-carotene was about 32 days, and vacuum packaging at 20 °C did not seem to improve retention. [18] That powder was neither freeze-dried nor a retail product. Follow the storage directions and dates on your package.

What the research does not show

The reviews on this page describe how freeze-drying affects foods in general, and the storage study measured one laboratory powder; none tested a retail spinach powder, and none measured effects in people. [2] [3] [18] Keeping a nutrient in a product during drying is not the same as showing a result in the person who eats it.

A spinach powder is not a replacement for vegetables or for medicine. ODS says supplements can’t take the place of the variety of foods that are important to a healthy eating routine, and that you are most likely to have side effects from dietary supplements if you take them at high doses, instead of prescribed medicines, or with many other supplements. [8]

Ingredient-label checklist for spinach powder

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

Find the ingredient name. Whole spinach, spinach juice and spinach extract are different ingredients. [12] [13] [14]
Look for a drying method. “Freeze-dried” is there only if the maker states it; none of the five records above names one. [15] [16]
Look for the plant part. Supplement labels should name it after the ingredient, such as leaves. [9]
Check for other ingredients. Read the full ingredient list for carriers or added ingredients.
Read the serving size as a labeling unit. Compare it with other products by weight, and note whether it is a Supplement Facts or Nutrition Facts serving. [10] [11]
Read what the panel declares, and what it leaves out. A missing vitamin K or potassium value is not a zero. [19] [20]
Ask about extract ratios. If a label says 4:1 or 20:1, ask the manufacturer what the ratio compares. [14] [16]
Check storage and dates. Keep the container closed, cool, dry and dark, and discard powder that shows mold. [17]
Bring medicine and health questions to your pharmacist. Mention warfarin or another blood thinner, kidney disease, medicines that can raise potassium, kidney stones, pregnancy or nursing. [4] [6] [7] [8]
Match the record to your container. DSLD includes labels for products no longer sold, so compare any entry with the label you have. [21]

Safety notes

ODS says a sudden change in the amount of vitamin K you get can cause dangerous bleeding (if you consume less) or blood clots (if you consume more) in people taking warfarin. [4] Warfarin prescribing information says leafy, green vegetables contain vitamin K, that too much vitamin K can lower the effect of warfarin, and that patients should talk to their healthcare provider before making any diet changes. [5]
ODS says people at risk of high blood potassium should talk to their health care providers about how much potassium they can safely get from food, beverages and supplements, and names ACE inhibitors and potassium-sparing diuretics as examples of medicines involved. [6] Neither spinach food record in the table lists a potassium value. [1]
NIDDK advises asking a health care professional which type of kidney stone you had, and talking with one about food sources of oxalate and how much oxalate should be in what you eat. [7]
ODS says supplements can interact with some medicines and asks you to tell your health care providers, including pharmacists, about any supplements you take. [8]
DailyMed posts labeling that companies submit to FDA; the National Library of Medicine (NLM) does not review it before publication. [22]

Where to go next

Whether a spinach powder product suits you, and in what amount, is a question for your doctor or pharmacist. More label guides are listed under Ingredients and labels. For how a supplement label lists vitamin forms, see the guide to a plant based vitamin b complex.

Common questions

What is freeze dried spinach powder?

It is spinach that has been freeze-dried and ground. Because raw spinach is about 91% water, 100 g of fully dried whole spinach holds about the solids of 1,163 g of raw spinach (our calculation). [1] Check the label to see whether it is whole spinach, juice or an extract. [13] [14]

Is freeze-dried spinach the same as dehydrated spinach?

Not necessarily. Both have had water removed, but freeze-drying removes it while the water is frozen, at lower temperatures than methods such as hot-air drying. [3] One spinach food record in FDC says “dehydrated spinach” without naming a method, and FDC has no composition entry for dried spinach. [1]

What is a serving of spinach powder?

Whatever the label defines. In the records on this page, that ranges from 1,000 mg on five supplement labels to 10 g on one food label. [12] [1] A serving size is a labeling unit, not a recommendation for you. [11]

Is spinach powder a substitute for vegetables or medicines?

No source on this page shows that it is. ODS says supplements can’t take the place of a variety of foods, and that side effects are more likely when supplements are taken instead of prescribed medicines. [8]

Is spinach powder high in vitamin K?

Spinach is a vitamin K source, and drying concentrates whatever the spinach holds, but the labels on this page do not declare vitamin K, so you cannot tell from them. [4] [1] If you take warfarin, talk with your pharmacist before adding it. [4]

Does freeze-drying keep nutrients?

A food-science review says the lower temperatures of freeze-drying allow maximal nutrient retention, but storage still matters: in a laboratory study, spinach juice powder lost beta-carotene with a half-life of about 32 days at 4 °C. [3] [18] Neither tested a retail freeze-dried spinach powder.

How should I store spinach powder?

Keep it in a clean, dry, tightly closed container in a cool, dry, dark place, open it as little as possible, and discard it if it turns moldy. [17]

If you take warfarin or another blood thinner, have kidney disease or take a medicine that can raise potassium (such as an ACE inhibitor or a potassium-sparing diuretic), have had calcium oxalate kidney stones, or are pregnant or nursing, ask your doctor or pharmacist before using spinach powder products. [4] [6] [7] [8]