SlimFast High Protein Shake review

SlimFast is less a single shake than a plan. Its site lays out the SlimFast Plan as one sensible meal, two meal replacements and three snacks a day, and says clinical studies of that calorie-controlled diet with exercise showed average weight loss of 1 to 2 pounds a week. The High Protein shakes list 20 grams of protein and 1 gram of sugar, and the range also covers Original shakes, Coffee House shakes, Keto shake mixes, smoothie mixes and a High Protein 14-Day Starter Kit. That structure suits people who want to be told what to eat on busy days. We could not confirm a price on a SlimFast page: the brand's own shop was password-protected on November 13, 2026, and its product links go to retailers such as Amazon, so the price stays pending. SlimFast warns that people with diabetes, who are pregnant or nursing, or who are under 18 should check with a doctor first. If you want a shake for general nutrition rather than weight loss, OWYN or Soylent is a better fit.

Who it is for

people following a structured weight loss plan

Price

See vendor pricing (USD check pending).

US price check pending. See the vendor pricing page.

Key features

• High Protein shakes list 20 g protein and 1 g sugar
• Built for the SlimFast Plan: one sensible meal, two meal replacements and three snacks
• Ready-to-drink shakes and shake mixes, including Original, High Protein, Coffee House and Keto
• High Protein 14-Day Starter Kit for new users
• Free recipes for breakfast, lunch, dinner and smoothies on slimfast.com

Strengths and weaknesses

• Strength: A clear daily plan for people who want structure
• Strength: 20 g of protein with only 1 g of sugar in the High Protein line
• Strength: Wide range of formats, from bottles to keto mixes
• Weakness: SlimFast's own store was closed; buyers are sent to retailers such as Amazon
• Weakness: Price could not be confirmed on a SlimFast page
• Weakness: Aimed at weight loss rather than full daily nutrition

Key facts

• Protein: 20 g (High Protein)
• Sugar: 1 g (High Protein)
• Plan: 1 meal, 2 shakes, 3 snacks a day
• Formats: Bottles and shake mixes
• Where to buy: Retailers

Where it ranks

SlimFast High Protein Shake is No. 7 in our Best Meal Replacement Shakes verdict.