Anyone browsing meal replacement shakes in the UK quickly meets a confusing shelf: powders labelled as ‘complete meals’, protein shakes that look almost identical, ready-to-drink bottles and very low calorie programmes sold as packs of soups and shakes. The labels rarely explain how these products differ, and price alone says little about what is in the tub. This article compares Herbalife Formula 1 Healthy Meal Nutritional Shake Mix (referred to as Formula 1 throughout) with the other main types of shake on sale, using the legal standard that a UK meal replacement has to meet as the yardstick. DietPal is run by an independent Herbalife member; this is not official Herbalife content, and we have tried to be even-handed about where Formula 1 fits and where it does not.

What makes a shake a ‘meal replacement’ in the UK

The phrase ‘meal replacement’ is not simply marketing language. Products sold as a “meal replacement for weight control” must meet a compositional standard first set out in Commission Directive 96/8/EC, which remains on the UK statute book (legislation.gov.uk, 1996). Per meal, the ready-to-drink product must provide between 200 and 400 kcal; protein must supply between 25% and 50% of its energy; fat must supply no more than 30% of its energy; and each meal must deliver at least 30% of the reference amounts of a specified list of vitamins and minerals, including at least 500 mg of potassium (legislation.gov.uk, 1996). The same legislation requires the label to state that the product is useful only as part of an energy-restricted diet, to remind the user to keep up an adequate fluid intake – and it forbids any reference to the rate or amount of weight loss (legislation.gov.uk, 1996).

Only products that meet this specification can carry the authorised health claims for meal replacements on the Great Britain nutrition and health claims register (Department of Health and Social Care, 2026). The wording is precise: substituting two of the main daily meals of an energy-restricted diet with meal replacements contributes to weight loss, and substituting one daily meal contributes to the maintenance of weight after weight loss. A product that does not meet the standard – however similar it looks – cannot lawfully make those claims, which is arguably the single most useful thing a shopper can check.

How Formula 1 measures up

The current Herbalife UK label for Smooth Chocolate Formula 1 gives a serving of two scoops (26 g) mixed with 250 ml of semi-skimmed milk as providing 227 kcal, 18 g of protein, 21 g of carbohydrate, 6.6 g of fat, 5 g of fibre and 0.6 g of salt, with 25 vitamins and minerals (Herbalife, 2026). Working the numbers through, protein supplies roughly 32% of the energy and fat roughly 26%, so the prepared shake sits within each of the bands described above; the label accordingly carries the authorised meal replacement claims (Herbalife, 2026). The principal protein source is soy protein isolate, with milk adding further protein when the shake is made as directed. Protein contributes to the growth and maintenance of muscle mass, which is one reason the protein share of a meal replacement matters when overall energy intake is reduced (Department of Health and Social Care, 2026).

Two practical points deserve mention. The figures above assume semi-skimmed milk; mixing with a soy drink or another alternative changes the totals, and the label’s own directions specify milk or soy beverage (Herbalife, 2026). Secondly, sugars on the label are 18 g per serving, of which 12 g come from the milk itself – worth knowing for anyone comparing labels line by line.

For people who avoid soy, gluten or lactose, Formula 1 Free From uses pea protein instead, and there is also a hot, savoury option in Formula 1 Savoury Meal Mushroom for those who tire of sweet flavours.

Formula 1 vs other meal replacement shakes, protein shakes and total diet replacement

The table below sets Formula 1 against the three other categories a UK shopper is most likely to meet. It compares types of product rather than named brands, since formulations change and the legal category is what determines how a product may be used and described.

	Formula 1 (meal replacement)	Other meal replacement shakes	Protein shakes (whey or plant)	Total diet replacement programmes
Intended use	Replaces one or two meals a day	Replaces one or two meals a day	Adds protein to the diet; not a meal	Replaces all food for a set period
Legal standard	Meets the meal replacement specification	Must meet it to use the meal replacement claims	No meal replacement standard applies	Separate whole-diet requirements in the same legislation
Energy per serving	227 kcal with semi-skimmed milk	200–400 kcal by law	Varies; often mostly protein	Very low; about 810 kcal a day in the DROPLET trial
Vitamins and minerals	25 per serving	At least 30% of reference amounts per meal	Not required	Designed to cover the whole day
Supervision	Self-directed, ideally with coaching	Self-directed	Self-directed	Usually with clinical or structured support

The distinction between the first two columns and the third is the one most often blurred. A protein powder can be an excellent way of raising protein intake – our own Protein Drink Mix is designed for exactly that – but unless it meets the meal replacement specification it is a supplement to meals rather than a substitute for one, and it lacks the vitamin and mineral profile the law requires of a meal replacement (legislation.gov.uk, 1996). Using a plain protein shake in place of breakfast and lunch every day may therefore leave gaps that a properly formulated meal replacement is designed to fill.

Total diet replacement sits at the other end. These programmes replace every meal for a defined period – the DROPLET trial, for instance, used products providing about 810 kcal a day for eight weeks, alongside weekly counselling, before food was gradually reintroduced (NIHR Evidence, 2018). They are effective in trials but are a different undertaking altogether; reviewers noted side effects such as constipation, fatigue and dizziness were more common in the diet group, and that this type of programme is best followed with professional support (NIHR Evidence, 2018). Formula 1 is not designed for this purpose.

What the evidence says about partial meal replacement

The most comprehensive review of partial meal replacement to date pooled 23 randomised controlled trials involving 7,884 adults with overweight or obesity, deliberately excluding very low calorie and total diet replacement studies (Astbury et al., 2019). In every comparison, programmes that included meal replacements produced greater weight loss at one year than the alternative diets, and the difference was largest where meal replacements were combined with additional behavioural support; the authors concluded that such programmes should be regarded as a valid option for managing overweight and obesity (Astbury et al., 2019). The evidence was not uniformly strong – only six of the trials were judged at low risk of bias across all domains – so the findings are best read as encouraging rather than definitive.

NHS dietetic guidance describes a broadly similar pattern of use: breakfast and lunch replaced with a fortified product, a balanced evening meal of normal food, planned snacks, plenty of low-calorie fluids and regular review, followed by a gradual return to ordinary meals, with some people keeping one replacement a day thereafter (Mersey Care NHS Foundation Trust, 2026). The same guidance notes that these plans are not suitable for children, adolescents or women who are pregnant or breastfeeding, and recommends speaking to a doctor or dietitian first (Mersey Care NHS Foundation Trust, 2026). It also points out, fairly, that hunger, boredom and social eating are the usual stumbling blocks. The support around the product appears to matter at least as much as the product itself.

Which type suits whom

For most adults who want a convenient, structured way of reducing energy intake while keeping protein and micronutrients adequate, a product that meets the legal meal replacement standard is the logical choice; Formula 1 is one such product, with a wide flavour range, free-from and savoury variants and coaching available alongside it. Someone who already eats well and simply wants more protein after training is better served by a protein shake. Total diet replacement is a distinct, more intensive approach that is generally best undertaken with clinical oversight. Whichever route is chosen, the shake is a tool within a wider plan – a balanced evening meal, regular activity, adequate fluids and sleep – rather than the plan itself. Our earlier article on the best time of day to consume Formula 1 covers timing in more detail, and how much Herbalife costs sets out typical budgets.

Frequently asked questions

Is Herbalife Formula 1 a meal replacement or a protein shake?

It is a meal replacement. Made as directed, it falls within the legal compositional requirements for meal replacements and carries the authorised claims for weight control (Herbalife, 2026; legislation.gov.uk, 1996).

Can I use a protein shake as a meal replacement?

Not reliably. Protein shakes are not required to provide the energy range or the vitamins and minerals specified for meal replacements, so they are better used alongside meals (legislation.gov.uk, 1996).

How many Formula 1 shakes a day should I have?

The authorised claims relate to replacing two main daily meals in an energy-restricted diet for weight loss, or one daily meal for weight maintenance after weight loss; the remaining meals should be balanced, ordinary food (Department of Health and Social Care, 2026; Herbalife, 2026).

Can I make Formula 1 with water?

The nutrition figures and directions on the UK label assume 250 ml of semi-skimmed milk or soy beverage; making it with water would provide less energy and protein than stated, so it would no longer match the label (Herbalife, 2026).

Is Formula 1 suitable for vegans?

The Smooth Chocolate powder is labelled vegan, so mixing it with a soy beverage rather than milk keeps the prepared shake plant-based; Formula 1 Free From uses pea protein instead of soy. Check the label of the specific flavour, as formulations vary (Herbalife, 2026).

Shopping with DietPal

If Formula 1 looks like the right fit, you can browse every flavour on the Formula 1 Healthy Meal Shake page or see the full weight management range. Every order includes free nutrition coaching, orders over £100 placed before 2pm qualify for free next-day delivery, and all products are covered by a 30-day money back guarantee. If you would like to talk through which product suits you before ordering, we are available on WhatsApp 24/7.

References

Astbury, N.M., Piernas, C., Hartmann-Boyce, J., Lapworth, S., Aveyard, P. and Jebb, S.A. (2019) A systematic review and meta-analysis of the effectiveness of meal replacements for weight loss. Obesity Reviews, 20(4), pp. 569–587. [online] Available at: https://ora.ox.ac.uk/objects/uuid:f0349179-d226-43c3-bc8f-d1aca396476a [Accessed 25 October 2026].

Department of Health and Social Care (2026) Great Britain nutrition and health claims (NHC) register. GOV.UK. [online] Available at: https://www.gov.uk/government/publications/great-britain-nutrition-and-health-claims-nhc-register [Accessed 25 October 2026].

Herbalife (2026) Formula 1 Meal Replacement Shake Mix, Smooth Chocolate: product label (GB). Herbalife Nutrition. [online] Available at: https://www.herbalife.com/assets/market-reusable-assets/emea/united-kingdom/documents/product-label/pl-4468-gb.pdf [Accessed 25 October 2026].

legislation.gov.uk (1996) Commission Directive 96/8/EC of 26 February 1996 on foods intended for use in energy-restricted diets for weight reduction. The National Archives. [online] Available at: https://www.legislation.gov.uk/eudr/1996/8/data.html [Accessed 25 October 2026].

Mersey Care NHS Foundation Trust (2026) What are meal replacements? Patient leaflet. [online] Available at: https://www.merseycare.nhs.uk/patient-leaflets/meal-replacement-plan-guide [Accessed 25 October 2026].

NIHR Evidence (2018) A total diet replacement programme helped obese people lose weight and keep weight off. National Institute for Health and Care Research. [online] Available at: https://evidence.nihr.ac.uk/alert/a-total-diet-replacement-programme-helped-obese-people-lose-weight-and-keep-weight-off/ [Accessed 25 October 2026].

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All references to weight management relate to the Herbalife Nutrition Weight Management Programme which includes, amongst other things, a balanced diet, regular exercise, an adequate daily fluid intake, nutritional supplementation where required and appropriate rest. Individual results will vary.

This article is for general information only and is not a substitute for advice from a GP or registered dietitian, particularly for anyone who is pregnant, taking medication or living with a medical condition. DietPal is run by Andrew Hill, an independent Herbalife member.