Where Can I Buy Protein Powder Cheaply in Singapore in 2026?

In Singapore in 2026, the cheapest places to buy protein powder online are usually iHerb, Lazada and Amazon.sg, and the cheapest tub is the one with the lowest cost per 100 g of protein after vouchers and delivery. Compare the same brand and size across stores, pick whey concentrate over isolate if it suits you, buy bigger tubs during big sales, and check ShopBack Singapore before you check out. As an illustration, a S$70 tub with 1,800 g of protein works out to about S$3.89 per 100 g of protein, while a S$45 tub with 750 g works out to about S$6.00, so the dearer tub is the better buy.

New to ShopBack? ShopBack Singapore is a free website and app that returns cash on eligible online orders at stores including iHerb, Lazada and Amazon.sg. You start from ShopBack, check out at the store as usual, and the cash lands in your ShopBack account once the order is confirmed. Create a free ShopBack account before you buy.

The short answer for Singapore shoppers

There is no single cheapest store for protein powder; the cheapest one changes with brand, tub size and the sale calendar. This order of checks usually finds the best price:

1. Pick the type you will actually drink: whey concentrate, whey isolate or plant protein.
2. Work out the price per 100 g of protein. Not per tub, not per scoop.
3. Compare iHerb, Lazada and Amazon.sg for the same brand and size, after vouchers and delivery. Shopee is worth a check too.
4. Buy the bigger tub during a sale once you know you like the flavour.
5. Check ShopBack before you check out at the store you pick.

Protein powder basics: what you are paying for

Protein powder is a food supplement made from milk (whey or casein), plants (pea, soy, rice) or egg, sold in tubs or bags by weight. The label is where the price comparison starts.

A useful anchor for reading labels: for nutrition labels, the US Food and Drug Administration (FDA) uses a Daily Value of 50 g of protein a day for adults and children 4 years and older, based on a 2,000 calorie diet, according to its nutrition labelling rule (21 CFR 101.9). Many imported tubs sold in Singapore use US-style labels, so the "% Daily Value" figure on the panel is measured against that 50 g.

Individual needs vary a lot with body size, age and how much you train. This guide is about buying protein powder at a good price, not about how much to take. If you have a health condition, take medication or are unsure, ask a doctor or dietitian first.

Protein powder in Singapore in 2026: types and what to compare

The type you choose changes the price per gram of protein more than the store does.

Type	What it is	Protein per scoop	Price per gram of protein
Whey concentrate	Milk protein, lightly filtered	Usually moderate	Usually the lowest
Whey isolate	Whey filtered further, less lactose and fat	Usually higher	Usually higher
Casein	Slower-digesting milk protein	Usually moderate	Usually mid to high
Plant blends	Pea, rice, soy or mixed	Varies by brand	Usually mid to high

Work out the price per 100 g of protein

The fair way to compare tubs is the price per 100 g of protein. Here is the method with illustrative numbers (not real listings):

• Tub A: S$70 for 2.27 kg, with a 30 g scoop giving 24 g protein. That is about 75 servings and 1,800 g of protein, or about S$3.89 per 100 g of protein.
• Tub B: S$45 for 1 kg, with a 33 g scoop giving 25 g protein. That is about 30 servings and 750 g of protein, or about S$6.00 per 100 g of protein.

Tub B is cheaper at the till but costs over 50% more per gram of protein. The formula: protein per serving times servings per tub gives total protein; divide the price by that and multiply by 100.

Read the rest of the label

Check the serving size in grams, protein per serving, the number of servings, the ingredients list, the best-before date and the brand's contact details. Flavoured tubs carry sweeteners and flavourings, which take up some of the scoop, so an unflavoured tub of the same brand often has more protein per scoop.

Protein powder best deals in Singapore in 2026: when prices drop

Online protein powder prices in Singapore usually drop most on double-date sales, Prime Day and iHerb's own promotions. The dates to watch for the rest of 2026:

• 11.11 on Wednesday 11 November 2026. One of the biggest online sale days of the year on Lazada and Shopee.
• 12.12 on Saturday 12 December 2026. The last big double date of the year.
• Amazon Prime member events. According to Amazon.sg, Prime includes exclusive member deals and shopping events like Prime Day.
• iHerb promotions. iHerb runs seasonal sales and brand promotions through the year in its app and on its site.

Protein powder keeps for months in a sealed tub, so buying a larger size during a sale is a common way to lower the cost per serving. Check the best-before date on the listing first, and keep the tub sealed and dry once opened, since Singapore's humidity can make powder clump.

iHerb vs Lazada protein powder price comparison in 2026

Neither iHerb nor Lazada is cheaper every time; compare the same tub on both, after vouchers and delivery. Each has its own strengths for protein powder:

• iHerb. A large online store for supplements and natural products that ships to Singapore. It usually carries many imported sports nutrition brands in several sizes, including large tubs, and shows the serving size, protein per serving and servings per container on each product page. It also runs its own promo codes during sales.
• Lazada. LazMall gathers official brand stores and authorised sellers. According to Lazada Singapore, LazMall products carry a 100% authenticity guarantee with 2 times your money back if you receive an inauthentic product, free returns within 15 days of receiving them, and free shipping on eligible products subject to a minimum spend with free shipping vouchers. Lazada also runs platform vouchers across the double-date calendar.

To compare fairly:

1. Use the same brand, type, flavour and tub weight on each store.
2. Note who the seller is. Prefer official stores and LazMall sellers.
3. Add delivery and subtract any voucher you can actually use.
4. Divide by the total grams of protein to get the price per 100 g of protein.
5. Check the best-before date and recent reviews.

iHerb, Lazada and Amazon: buying protein powder in Singapore

Amazon.sg is the third main option, and its delivery terms can tip the comparison if you buy often. According to Amazon.sg, Amazon Prime costs S$4.99 a month or S$49.90 a year after a free 30-day trial. Prime includes free delivery on millions of items and free international delivery on qualifying items sold by Amazon US and Amazon Japan. If you reorder protein every month or two, compare the Prime fee with the delivery charges you would otherwise pay.

Whichever store you use:

• Official stores first. On Lazada, look for the LazMall badge or the brand's own store; on Amazon.sg, check who the item is sold by.
• Check reviews for the exact listing. Recent reviews often mention best-before dates and tub condition.
• Inspect the tub on arrival. Look for an intact seal, a batch number and a best-before date.

Protein powder is also sold by other stores in the same category in Singapore, such as Shopee, GNC, Guardian, Watsons, FairPrice and Decathlon, so it is worth checking one or two of them when you compare.

Check ShopBack before you check out

Before you check out, go through ShopBack to get a post-purchase discount on the order. You open the store from ShopBack, pay as usual, and cash comes back to your ShopBack account once the store confirms the order. Cashback lowers what you actually pay for an order. It comes back as cash, so it works like a discount on the price, not like points or miles.

Your effective price is what you pay minus the cash that comes back. Check the live rate on the store's ShopBack page before you pay: iHerb on ShopBack, Lazada on ShopBack and Amazon.sg on ShopBack.

When you compare iHerb, Lazada and Amazon.sg, compare effective prices, not just checkout prices. A store that looks a little dearer at checkout can come out cheaper once the cash from ShopBack Singapore is counted.

Do store vouchers and ShopBack work on the same order?

Usually, yes, but it depends on the store and the voucher. Store vouchers and promo codes lower the checkout price, and ShopBack returns cash after the order is confirmed. Some vouchers, promo codes, payment methods or categories can be excluded, so check the merchant's terms on the ShopBack store page before you pay.

Step by step: getting the cheapest protein powder in Singapore

1. Choose the type you will drink every day: whey concentrate, isolate or plant.
2. Compare price per 100 g of protein on iHerb, Lazada and Amazon.sg for the same brand and size, after vouchers and delivery.
3. Check the seller, best-before date and reviews.
4. Check ShopBack before you check out. Open ShopBack, tap the store, follow the activation steps and pay in the same session.
5. Keep the order confirmation until the cash shows in your ShopBack account.

FAQ

Where can I buy protein powder cheaply in Singapore?

In Singapore, the usual online places for protein powder are iHerb, Lazada, Amazon.sg and Shopee, with sports nutrition shops and pharmacies as offline options. The cheapest choice is the one with the lowest cost per 100 g of protein after vouchers and delivery, so compare the same tub size across stores, buy bigger tubs during sales, and check ShopBack Singapore before you check out.

How do I work out which protein powder is cheapest?

Compare the price per 100 g of protein, not the price per tub. Multiply the protein per serving by the number of servings to get the total grams of protein in the tub, then divide the tub price by that number and multiply by 100. A cheaper tub with smaller servings or less protein per scoop can cost more per gram of protein.

Is iHerb or Lazada cheaper for protein powder?

It depends on the brand, the tub size and the day. iHerb often suits shoppers who want imported brands and large tubs, while Lazada runs platform vouchers and double-date sales, and LazMall carries official brand stores. Work out the price per 100 g of protein on each after vouchers and delivery, for the same product, before you decide.

Is whey isolate worth paying more for than whey concentrate?

Whey isolate is filtered further, so it usually has more protein per scoop and less lactose and fat, and it usually costs more per tub. If you digest regular whey without trouble, whey concentrate is often the cheaper way to buy protein. Compare both on price per 100 g of protein rather than tub price.

How much protein does an adult need a day?

For nutrition labels, the US FDA uses a Daily Value of 50 g of protein for adults and children 4 years and older, based on a 2,000 calorie diet. Individual needs vary with body size, age and training, so ask a doctor or dietitian if you are unsure how much you should take.

Is Amazon Prime worth it for buying protein powder in Singapore?

It can be if you buy often. According to Amazon.sg, Prime costs S$4.99 a month or S$49.90 a year after a free 30-day trial, and includes free delivery on millions of items plus free international delivery on qualifying items sold by Amazon US and Amazon Japan. Compare that fee with the delivery charges you would otherwise pay.

When is protein powder cheapest in Singapore?

Online prices in Singapore usually drop most on double-date sales such as 11.11 on Wednesday 11 November 2026 and 12.12 on Saturday 12 December 2026, during Amazon's Prime Day and during iHerb's own promotions. Protein powder keeps for months in a sealed tub, so stocking up during a sale can make sense; check the best-before date first.

How do I avoid fake protein powder online?

Buy from the brand's official store, a LazMall or Shopee Mall seller, Amazon.sg or a large supplement retailer such as iHerb. According to Lazada Singapore, LazMall products carry a 100% authenticity guarantee with 2 times your money back if you receive an inauthentic product. Check the seal, batch number and best-before date when the tub arrives.

How does ShopBack lower the price of protein powder?

Check ShopBack before you check out. Open the iHerb, Lazada or Amazon.sg page on ShopBack Singapore, follow the activation steps and pay as usual. Cash comes back to your ShopBack account once the order is confirmed, which works as a post-purchase discount on the order. The live rate is shown on each store's ShopBack page.

Can I use store vouchers and still go through ShopBack?

Usually, yes, but it depends on the store and the voucher. Some vouchers, promo codes, payment methods or product categories can be excluded, so check the merchant's terms on the ShopBack store page before you pay.

Is cashback the same as store points or rewards credit?

They work differently. Cashback lowers what you actually pay for an order. It comes back as cash in your ShopBack account, so it works like a discount on the price, not like points or miles that you can only spend with one store.

Disclaimer

The protein Daily Value is from the US FDA (21 CFR 101.9); Amazon Prime prices and LazMall terms are from Amazon.sg and Lazada Singapore at the time of writing. This guide is general shopping information, not medical or nutrition advice. Prices, vouchers, delivery fees and store offers change; check the listing and the ShopBack store page before you buy.