Optimum Nutrition Sold Out

Optimum Nutrition Serious Mass 12lb

NZD $150.00
Or payments from NZD $25.00 Laybuy Afterpay

What is it?

Optimum Nutrition Serious Mass is a High-Calorie Mass Gainer Protein Powder.

What will it do?

Optimum Nutrition Serious Mass is a protein powder very high in carbohydrates and calories that can be used to increase your daily protein and calorie intake. Increasing your protein and calorie intake is vital for muscle growth, so combined with a sensible dieting and training regime, Optimum Nutrition Serious Mass will help you build muscle.

How do take it?

Optimum Nutrition Serious Mass can be taken at any time of day when you need a pure, high-quality source of protein and calories.

For athletes who find it hard to build muscle, Supplement Solutions recommends taking one whole serve of Optimum Nutrition Serious Mass at least once per day in addition to solid food meals.

For athletes who find it easy to build muscle, Supplement Solutions recommends taking half a serve of Optimum Nutrition Serious Mass as a meal substitute as required throughout the day. Simply mix the powder with water in a Supplement Solutions Protein Shaker, shake it up, and drink away!

What will it do?

Combined with a sensible dieting and training regime tailored to your health and fitness goals, the extra protein and calories that you consume from Optimum Nutrition Serious Mass will start to take effect within the first 2 weeks. You will continue to experience physique-changing results indefinitely, provided you stick to your dieting and training regime.

Prices and payment

All prices are in New Zealand dollars and include GST unless stated.

Payment for goods from the website can be made by MasterCard, Visa, American Express and/or Internet Bank Transfer. Orders are not accepted until full payment is received / approved. 

Payment via Afterpay and LayBuy accepted.


Delivery charges

Orders over $60 receive free delivery.

All orders $60 or under will be charged a flat shipping rate of $4.

An additional $10 will be charged if an order includes larger tubs of protein powders.


Delivery time estimates

We use Post Haste Couriers, NZ's most extensive delivery network. Orders are dispatched as quickly as possible to ensure prompt delivery. Post Haste call-in to collect parcels in the afternoon, therefore same day dispatch applies to orders placed before 2pm. 

When your parcel is picked up you will receive a confirmation email with tracking information for your goods. To ensure a fast delivery, we suggest you have your package delivered where you will be during working hours. However parcels can be left at your door upon request (at your own risk), please note this in the comments at check-out.

Approximate delivery times (during normal work hours, Monday-Friday) are as follows:

  • Christchurch - allow up to 2 days, typically overnight.
  • North Island - overnight delivery or 2 days with economy (for larger parcels)
  • South Island - overnight delivery, or 2 days with economy (for larger parcels)

Rural deliveries can sometimes take an extra few days. Post Haste does not deliver on weekends or public holidays.


International orders

Supplement Solutions does not ship outside of New Zealand.


Returns of Damaged or Faulty Product

When you receive your parcel, please check it as soon as possible and if there are any issues please email us at info@supplementsolutions.co.nz with your order number and photos of the damaged product.

In the event that you receive faulty or damaged goods and require a refund, please contact us and we will endeavour to either replace the product(s) or provide you with a refund. Claims must be received within seven days of receipt of goods.


Refunds and Returns

For hygiene and health & safety reasons in alignment with FSANZ guidelines, we do not accept returns for change of mind purchases.



Orders can only be cancelled prior to dispatch to your address.  After dispatch orders cannot be cancelled for any reason.


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Customer Reviews

Based on 10 reviews
Hemi R.

Orsome service will recommend to my family friends

Dani A.

I was happy with your service thanks

Saxon B.

I use to buy them at the shop now buy them online and save me travelling back n forward. Love it!

Ofa K.

Very fast

Colin C.

Absolutely fantastic, thank you very much. I will definitely be back for more