Optimum Nutrition

Serious Mass

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Optimum Nutrition Serious Mass

Overall

#1236 in

Protein Powder

according to Reddit Icon Reddit

User sentiment27% positive
3
3
5
Last updated: Apr 9, 2026

Reddit Reviews

Reddit Iconakohlsmith 1.0
r/canadaLead levels in protein powder, shakes flagged by Consumer Reports
6 months ago

Avoid: * Naked Nutrition * Huel Once per week: * Garden of Life * Momentous 100% Plant Protein Occasionally: * MuscleMeds * Optimum Nutrition Serious Mass * Optimum Nutrition Gold Standard Protein Shake * Jocko Fuel * Vega * Quest * Orgain * Equip Foods * Plant Fusion * Ensure * Muscle Milk * KOS Better Choices for Daily Consumption: * Owyn * Transparent Labs * Optimum Nutrition Gold Standard 100% Whey * BSN * Momentus Whey Protein Isolate * Dymatize * Muscle Tech Only the last one - Muscle Tech - is listed as no limit on safe consumption.

r/canadaLead levels in protein powder, shakes flagged by Consumer Reports
6 months ago

negative. Optimum Gold Standard Protein Shake was orange, at above 150% of consumer report's level of concern for lead, and recommend to limit to 4 2/3 servings per week. The Optimum Gold Standard 100% Whey is what was green across the board and recommend 1 3/4 servings per day.

r/canadaLead levels in protein powder, shakes flagged by Consumer Reports
6 months ago

well I guess we can chalk up the disagreement to lack of specificity. "Optimum Gold Protein Powder" isn't listed in the consumer reports article (unless I am blind, which may in fact be the case). There are two Optimum products listed: * Optimum Nutrition Gold Standard Protein Shake - not recommended * Optimum Nutrition Gold Standard 100% Whey - recommended If I've missed one or miscategorized one I'll edit my post right away, but I believe I've got them listed correctly.

r/canadaLead levels in protein powder, shakes flagged by Consumer Reports
6 months ago

Careful - Optimum Nutrition Gold Standard Protein Shake is listed under "occasionally" and their Gold Standard 100% Whey is listed under "better choices for daily consumption". Kudos on calling out Muscle Tech as having no limit on safe consumption. I missed that and grouped it with the rest of the ones in the same category.

Reddit IconAmazing_Loquat280 1.0
r/workoutHealthiest protein powder?
3 months ago

Here’s the consumer reports study on which brands/lines actually have heavy metals: https://www.consumerreports.org/lead/protein-powders-and-shakes-contain-high-levels-of-lead-a4206364640/ In my experience optimum nutrition gold standard whey (double rich chocolate) has been good. No dangerous level of heavy metals per the report, not super high in sugar. If you take it with water it tastes like ass, but with milk (I use whole) it’s surprisingly pretty good. There’s a number of brands that didn’t appear to have the heavy metal problem, so if that’s a worry, consult the report (note, optimum nutrition’s serious mass protein *did* have more heavy metals, so check by product, not just by brand)

Reddit IconGlittering-Quiet9632 1.0
r/TrueRedditProtein Powders And Shakes Found To Contain High Levels Of Lead, Report Says
6 months ago

Actually Optimum Nutrition is NOT clean on the list. The Optimum Mass Powder was unusually high in arsenic, and not recommended to take daily. The Whey protein powder seemed to be better though. So hopefully that's what you've used

Reddit IconGreen_Olive1954 1.0
r/TrueRedditProtein Powders And Shakes Found To Contain High Levels Of Lead, Report Says
6 months ago

I take a half serving of optimum nutrition serious mass every day. I’m wondering if I’m still on the safe side? (One scoop)

Reddit IconSanityInAnarchy 1.0
r/TrueRedditProtein Powders And Shakes Found To Contain High Levels Of Lead, Report Says
6 months ago

*Some* of it is. Some of it isn't. Their "Serious Mass" brand tested high for *arsenic,* and they recommended keeping it to a couple times a week, instead of every day. The "Gold Standard" one came in at around half the point where they'd be concerned about one serving a day. But this is a problem with the supplement industry in general. Big Pharma has its problems, and Big Food has its problems, but Big Supplement and Big Vitamin can be just as bad, only they're far less regulated.

Reddit IconSilly_Randy 1.0
r/workoutLooking for a good protein powder. Will any do?
about 2 months ago

If you want mad calories the. Serious Mass by optimum nutrition. Make it with milk and you get even more calories!

Reddit Iconvlmoney27 1.0
r/TrueRedditProtein Powders And Shakes Found To Contain High Levels Of Lead, Report Says
6 months ago

Crazy thing for me is when I saw and read that article some days ago I was on my last couple of servings of serious mass for 18 days straight this month. I said I'll stop using it for the rest of the month. I still have a full 12 pound bag left.

Reddit Icon802ScubaF1sh 0.0
r/workoutThe Best Protein Powder at the Moment?
8 months ago

Our Costco almost always has the Kirkland, ON, and Orgain plant powders for a great deal. Look for the 'Aussie Bites' in the snack section, the ingredients / protein is pretty crazy for the small bites.

Reddit IconAlive-Trust-1980 0.0
r/Fitness_IndiaAfter years of buying only the cheapest whey, I realized protein is worth spending on
about 2 months ago

Hi. I have tried GNC and ON and didn't like both. How is MB in terms of quality ? Heard the taste is good.