$21.97 per container, before delivery
$7.32 per 25g protein, before delivery
Delivery extra; amount unknown
Price checked Nov 13, 2026.
Buy at BulkSupplements.com →Label, prices & sources →Optimum Nutrition Gold Standard 100% Casein, Chocolate Supreme (1.87 lb)
B · Informed Choice
Label read Oct 31, 2026. Where the data comes from
Is Optimum Nutrition third party tested? · Which casein protein brands are third-party tested?
Comparing with a package we do not list? Cost per dose calculator
Cost
$2.40
per 25g protein
$57.49
per container · Optimum Nutrition (direct)
$71.86
a month at one dose a day, before delivery
Also contains magnesium 85 mg and zinc 11 mg. The price per dose counts protein only.
Amount per serving
24g protein
Servings per container
25
Units needed per dose
1.04 scoops
Doses per container
24.0
Cost per serving
$2.30
- Grams of protein per serving as printed on this size's own panel (ONUS-gold-standard-casein_Label_Chocolate-Supreme_2lb_25-servings.jpg): "Protein 24g" in a "34g (About 1 Scoop)" serving, "25 servings per container". We leave the net weight out on purpose. We price the protein in the powder, not the powder itself, so we never divide one weight by the other. The 1.87 lb in the name is the front label's own "NET WT 1.87 LB (850 G)". The panel also prints "Magnesium 85mg 20%" and "Zinc 11mg 100%", and its ingredient line names magnesium oxide and a zinc sulfate. Both are marked as also in the tub and not counted in the price per dose. No face read prints a gluten, vegan or vegetarian statement, so gluten free is Unknown; casein is from milk, so not vegan.
Delivery
Delivery cost
$5.99
Below free delivery (orders over $75.00); $17.52 more would make delivery free.
Cost per dose delivered
$2.65
To get free delivery
Spend $17.52 more at Optimum Nutrition (direct)
Delivery policy: Optimum Nutrition (direct), Optimum Nutrition (direct) delivery terms, re-read November 1, 2026 · checked Nov 1, 2026
Buying more than one? Calculate the order
Change the quantity to see the actual container subtotal and whether it reaches the recorded free-delivery threshold.
- Container subtotal
- $57.49
- Delivery
- $5.99
- Order total, before tax
- $63.48
- Per 25g protein, delivery included
- $2.65
25 labeled servings in this order. Comparison doses are a price yardstick, not advice about how much to take.
Unit price checked Nov 13, 2026.
View this package at Optimum Nutrition (direct) →Set the quantity at the retailer. This calculator does not add items to a cart. Uses the recorded unit price with no coupon or quantity discount. Tax is extra. Delivery terms apply to the contiguous US unless the policy says otherwise.
Delivery terms and limits
Standard delivery in the US is free on orders over $75 and costs $5.99 below that, from the delivery chart on Optimum Nutrition's Delivery Information page, read October 2, 2026. The storefront's announcement bar has read "Free shipping on orders above $75" since at least September 7, 2026. Subscription orders also ship free at any size, but that is a different purchase from the one-time price shown here. Read again on October 17 and November 1, 2026, with the same chart row.
Where to buy
Optimum Nutrition (direct) · lowest recorded available price
we earn nothing on this link
checked Nov 13, 2026$57.49Buy
Ordered by price, lowest first, and labeled so you can see what each link earns us. Commission is never an input to that ordering. If the retailer with the lowest current price pays us nothing, that is still the one we send you to. No link on this page earns us anything. Every Buy button is a plain retailer link.
Price history
Latest recorded price: $57.49 at Optimum Nutrition (direct), checked . Unchanged since we started checking on Oct 31 (5 checks).
We check each price about once a day, so this is the range we recorded, not necessarily every price there has been. It says what changed, not why, and nothing about where the price goes next.
Verification level B: Independently tested
A third party with no commercial stake in the product has tested it and published the result: Informed Sport, Informed Choice, IFOS, BSCG, or an independent laboratory. What that testing covers varies by program and is not always what you would assume: Informed Sport and Informed Choice screen finished batches for substances banned in sport and review manufacturing procedures on paper, which is not the same as confirming the label’s dose or testing for heavy metals. The listings below say which program this is, so you can check what it actually covers.
- Current listing found: Informed Choice.
- Checked NSF Certified for Sport database on Oct 31, 2026: not listed.
- Checked USP Verified database on Sep 21, 2026: not listed.
NSF Certified for Sport: checked, not listed
Checked and absent. NSF's whole Certified for Sport directory was read on Oct 31, 2026, 2,602 listings, and holds two Optimum Nutrition rows, 1256427 "GOLD STANDARD 100% WHEY DOUBLE RICH CHOCOLATE" and 1484223 "Gold Standard 100% Whey Vanilla Ice Cream", both the Gold Standard 100% Whey line; none of the 4 listings whose product name contains "casein" is this brand's. The panel image read for this package prints no NSF mark. Absence from a database is not a failed test.
Source: NSF Certified for Sport, NSF Certified for Sport directory, full read, October 31, 2026, searched for casein (Bulk Supplements, Nutricost, Optimum Nutrition) · checked Oct 31, 2026USP Verified: checked, not listed
Checked and absent. We read all 16 pages of USP's own Verified Products directory in a browser on Sep 21, 2026: 159 products from 16 brands. We saved a copy. This brand is not in it: not in the directory's brand filter, and not in any product name. USP verifies the products a company submits to it, so this shows only which products were submitted. Not being listed is not a failed test.
Source: USP, USP Verified Products directory, full read, September 21, 2026 · checked Sep 21, 2026Informed Sport: checked, not listed
Optimum Nutrition is on LGC's own Informed Sport product list of October 2026, read on Oct 3, 2026, with nine lines printed under the brand, all of them Elite Series or Carb Energy Gel lines, and none of them names casein. Not being listed is not a failed test. Informed Sport certifies what a company submits, so this means only that this product was not on the published list that day.
Source: LGC (Informed Sport), Informed Sport product list, October 2026 PDF, as read October 3, 2026 · checked Oct 3, 2026Informed Choice: currently listed
LGC's own Informed Choice product list of October 2026, read on Oct 3, 2026, prints "ON Gold Standard 100% Casein (USA)" under Optimum Nutrition, beside a separate "100% GOLD STANDARD CASEIN (UK)" line. That names this product and the United States, the way the same block's "ON Gold Standard Plant Protein (USA)" names that product. A line with no region leaves open which country's product it covers; this one says, so that question does not arise. No label face read for this package shows an Informed Choice mark. The list prints no package size, flavor, batch or date, and Informed Choice names no package on any listing, so the question we ask of NSF listings, whether they name this package size, does not apply here. A listing like this says the product is in the program. It does not say that any one package or batch was tested.
What Informed Choice checks
| Confirms the label’s dose | Not stated |
| Tests for heavy metals / contaminants | Not stated |
| Screens for substances banned in sport | Yes |
| Reviews manufacturing | Paper-based review |
| Testing frequency | Periodic |
From the program's own published description of its process. Source. “Not stated” means the program does not publish a clear answer. It does not mean no.
No laboratory report with figures is recorded here for this product.
Not established: Heavy-metal testing, Label-accuracy testing.
Absence of data is not evidence that a product is clean. It means we found no published result for that testing.
Label
Form
powder
Serving size
1 scoop
Active ingredient
Protein: 24g as labeled
Grams of protein per serving as printed on this size's own panel (ONUS-gold-standard-casein_Label_Chocolate-Supreme_2lb_25-servings.jpg): "Protein 24g" in a "34g (About 1 Scoop)" serving, "25 servings per container". We leave the net weight out on purpose. We price the protein in the powder, not the powder itself, so we never divide one weight by the other. The 1.87 lb in the name is the front label's own "NET WT 1.87 LB (850 G)". The panel also prints "Magnesium 85mg 20%" and "Zinc 11mg 100%", and its ingredient line names magnesium oxide and a zinc sulfate. Both are marked as also in the tub and not counted in the price per dose. No face read prints a gluten, vegan or vegetarian statement, so gluten free is Unknown; casein is from milk, so not vegan.
Other actives
magnesium 85 mg and zinc 11 mg
Printed on the panel, and not counted in the price per dose.
Vegan
No
Gluten free
Unknown
Allergens
contains milk, contains soy
Ingredients
Micellar Casein, Cocoa Powder (Processed with Alkali), Natural and Artificial Flavor, Salt, Gum Blend (Guar Gum, Gum Acacia, Xanthan Gum), Sunflower and/or Soy Lecithin (emulsifier), Magnesium Oxide, Acesulfame Potassium (sweetener), Sucralose (sweetener), Zinc Sulfate Monohydrate
Label facts rest on: Optimum Nutrition, Nutrition Facts panels and front labels: Optimum Nutrition Gold Standard 100% Casein, Chocolate Supreme, 25 and 53 servings · checked Oct 31, 2026
Other tracked packages
Packages in the same category and format, with the same ingredients. Where we recorded the ingredient forms from the label, only packages with the same forms are shown. Where a category is compared by strength, they also have the same labeled strength. Only current prices are shown, cheapest container first. Prices are before delivery. Formulas, flavors and allergens may differ: check each label. These are browsing options, not recommended substitutes.
$24.97 per container, before delivery
$3.12 per 25g protein, before delivery
Delivery extra; amount unknown
Price checked Nov 13, 2026.
Buy at BulkSupplements.com →Label, prices & sources →$32.97 per container, before delivery
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Delivery extra; amount unknown
Price checked Nov 13, 2026.
Buy at BulkSupplements.com →Label, prices & sources →What this rests on: Prices are the last ones we recorded at the retailer named on each product page. Prices go stale, so each page says when it was checked. We track some products, not every one sold, and Amazon and Walmart are not among our stores. Listings and labels are read at the source, and each page links to them. Found an error? Tell us. The full method: How we compare.