A man lifting a barbell with his muscle showing

Serious Mass Results in How Many Days

With so many mass gainer supplements available, finding one that works effectively can be difficult.

Luckily I have vast experience with mass gainers, having used many of them over the years and Optimum Nutrition Serious Mass is one that often stands out. Is it a good choice, and how many days will it take for you to start seeing noticeable muscle gains? Keep reading to find out…

Serious Mass Results: in How Many Days?

If you are trying to gain significant muscle mass, it will likely take 3-6 months to see substantial results.

A weighing scale with blue tape measure on top of it

You will likely see changes before this time; and your overall results depend a lot on your starting point. If you’ve never tried gaining mass before, you may see faster results. If you’ve already pushed your body to its limit in the past, your gains might be harder to come by.

No matter what, the key to your success will be consistency. You must take Optimum Nutrition Serious Mass regularly, with a healthy protein-rich diet and regular weight training sessions.

What Are Serious Mass Supplements?

The Optimum Nutrition Serious Mass supplement contains 50 grams of protein, 5.5 grams of fat, 251 grams of carbohydrates, and various vitamins, minerals, and amino acids in every two scoops of protein powder to increase muscle mass. While the protein content is a bit lower per scoop than a standard protein shake, the carbohydrate and fat content will increase the overall calorie content.

Benefits of Serious Mass include:

  • Weight gain
  • Muscle and strength increase
  • Gym performance boost
  • Better muscle recovery

Serious Mass contains 1,250 calories per serving, significantly increasing your daily calorie intake. If consumed alongside a healthy diet with resistance training, it can help you see noticeable gains in muscle mass.

To gain muscle mass you need two main things:

  • calorie surplus
  • high amounts of protein

Serious Mass gives you both of these. And while I typically recommend getting most of your extra calories as protein, sometimes a product like Serious Mass is the way to go if you have trouble hitting a calorie surplus with protein alone.

How Long Does It Take for Serious Mass to Work?

Taking a mass gainer will likely result in almost immediate performance increases due to the additional fuel you have consumed. This will help you to break through some of your gym plateaus.

Over the next few weeks and months, your weight gain will become more noticeable as you use the additional nutrients to gain muscle. Just keep in mind that taking Serious Mass without going hard in the gym will most likely give you a gut. A calorie surplus is only good when you are working out with intensity.

Immediate Serious Mass Results: Performance and Fueling

The first thing you will notice when taking a mass gainer will be an almost immediate performance boost, which will be due to the increase in carbohydrates and protein in your diet.

A man lifting a barbell with his muscle showing

The increase in carbs will increase your muscle glycogen stores and result in an overall increase in your energy levels, which you can use to perform at 100% at the gym. Knowing how much protein you need and increasing it will improve recovery from these workouts, as protein is essential for muscle repair.

Short-Term Serious Mass Results: 1 Week to 1 Month

As your energy levels and recovery improve, you will notice that you are now seeing an increase in size. If you have been consistent with your diet and training regime, you may experience a 1-2 pound increase in lean muscle mass.

While this may seem like a slight increase, it will be a good confidence booster to help you remain consistent and see even greater results over time.

Mid-Term Serious Mass Results: 1 Month to 6 Months

By the 6-month mark, you should notice significant changes to your body, with a 6-12 pound increase in lean muscle mass.

Depending on your goals, you may want to continue your bulking diet, or you may want to consider a cut, where you will continue your training while reducing your calorie intake to drop body fat and reveal that hard-earned muscle mass.

Benefits of Serious Mass

You should use a mass gainer like Serious Mass for numerous reasons. Here are some main reasons to consider adding this supplement to your stack.

Workout tools like bands, shoes, watch, drinks, and jumping rope placed on the ground

Rich in Carbohydrates

Serious Mass is full of carbohydrates, which will help give you the energy you need to give your all the next time you decide to work out.

They Are Calorie Dense

If you are someone who struggles to gain weight, you will know how difficult it can be to get enough calories through diet alone. A mass gainer will contain a ton of calories in each serving.

Rich in Macronutrients

Mass gainers are full of macronutrients like protein, fats, and carbohydrates that your body requires for various purposes. Protein shakes are typically lower in carbs and fats, meaning you must get these macros from other sources.

Gains in Muscle Size and Strength

You need to be in a calorie surplus to gain muscle mass, which is precisely what mass gainers are designed for. The nutrients found in Serious Mass will also help increase energy levels, ensuring you can perform the required reps at the gym, while the protein can aid recovery.

Combined, you will see an increase in both muscle size and strength over time.

Easy to Use

Mass gainers are a simple way to increase your calorie intake. This is especially important for those who struggle to consume large meals or need to fit in extra calories between meals.

A man doing side exercise on a mat

When Should I Take Serious Mass for Best Results?

For best results, you should take Serious Mass between meals to increase your overall calorie intake and nutrients to aid recovery, or before bed.

Is It Okay to Drink Serious Mass Before Bed?

Yes, you can drink Serious Mass before bed. Consuming a protein shake 30 minutes before bed is often recommended to provide your body with the calories and protein that help build muscle while you sleep. This is how often you should drink protein powder.

Is It Okay to Take Serious Mass Without Working Out?

Yes, it is completely fine to take Serious Mass without working out. Some people may want to use a mass gainer if they are underweight, nutrient-deficient, or on a liquid diet. You should understand that consuming a high-calorie drink without exercise will likely increase body fat rather than muscle mass.


Mass gainers like Optimum Nutrition Serious Mass are designed to provide additional daily calories to help you gain muscle mass quickly.

You will likely be disappointed if you expect noticeable results within a few days or weeks. However, mass gainers like this are highly effective, and you will undoubtedly see noticeable results within 3-6 months of use if you consistently follow a healthy protein-rich diet with regular weight training sessions.

Jack Kelle

Jack is an entrepreneur, outdoorist, and animal lover with a background in philosophy, psychology, and business. He enjoys music, friends, and family. At RAVE, Jack works as the manager of marketing and content development.