Are Juice Cleanses Safe?

Fine for Most, But Not Everyone

Let us start plainly. For a generally healthy adult, a short cleanse of a day to a few days is widely considered safe. You are taking in a large volume of vegetables and fruit in liquid form and staying well hydrated, which is a long way from starving yourself. Kept short and sensible, it is a gentle thing.

The important word is short. A cleanse is a brief reset, not a way of eating and it is not the right choice for certain people at all. Being clear about who should skip it is not a disclaimer we tuck at the bottom, it is the most useful part of this page. The honest version of the whole idea is the 3-day reset.

Who Shouldn't Do a Juice Cleanse

If any of these apply to you, a juice-only cleanse is not the right choice and you should speak to your doctor before changing how you eat.

If you are...	Why to skip it
Pregnant or breastfeeding	Your body has higher, steady nutritional needs that a juice-only stretch does not meet.
Living with diabetes	An all-juice diet can affect blood sugar in ways that need medical oversight.
On regular medication	Big changes to what you eat can interact with how some medicines work.
Managing a medical condition	Conditions affecting the kidneys, liver or gut in particular need tailored advice.
Living with, or recovering from, an eating disorder	Restrictive patterns can be harmful and this is best avoided. Please seek support.
Under 18	Growing bodies need consistent, full nutrition, not a cleanse.

This list is not us being overly cautious. It is the genuine line between a sensible reset and something that could do harm. If you are unsure where you fall, check with a GP first, that is always the safe move.

What to Watch For and When to Stop

Even for a healthy adult, a cleanse is not a test of willpower. A little hunger on day one is normal and a mild caffeine or sugar dip is common while you adjust. Those usually settle. But feeling faint, dizzy, unwell or genuinely weak is not something to push through. If that happens, stop and eat something. Ending a cleanse early because your body asked you to is a sensible decision, not a failure.

The golden rule is simple: a cleanse should feel like a gentle reset, not a struggle. If it stops feeling that way, come off it. There is no prize for gritting your teeth through it and nothing is lost by choosing a shorter or gentler version next time.

How to Cleanse Sensibly

If you are in the clear to try one, a few simple things keep it safe and comfortable. Keep it short, especially your first time, a one or three-day rather than a week. Stay well hydrated with water alongside your juices. Go gentle on exercise, this is not the week for a hard training block. And prepare and ease out properly, easing off caffeine and heavy food beforehand and coming back to whole food slowly afterwards, which we cover in how to prepare for a cleanse.

Choose sensibly too. A vegetable-forward, cold-pressed cleanse on generous servings keeps you far more comfortable than a thin, fruit-heavy one. And if a full juice-only stretch feels like too much, the Juice 'Til Dinner plan keeps a proper evening meal and is the gentlest way in. There is no need to jump in at the deep end.

Built to Be Sensible

Our own cleanses are built around this. They are short by design, vegetable-forward to keep the sugar down and generous enough in volume that you are properly nourished across the days, not left running on empty. And we tell you plainly who should skip it, because a cleanse sold honestly is a safer cleanse. If you want the fuller picture of whether it suits you, read is juice cleansing good for you.

Sensible Places to Start

Short, vegetable-forward and gentle enough for a first go (or browse all our cleanse guides):

The Bottom Line

For most healthy adults, a short juice cleanse is a safe and gentle reset. For some people it is not the right choice at all and knowing which group you are in is the whole point. Keep it short, listen to your body, choose a sensible cleanse and speak to your doctor first if any of the cautions apply to you.

If you are in the clear and fancy a reset, a 1 Day or the 3-day Signature is a sensible place to start and the rest of the cleanse hub covers how to do it well.

Where to Start

Browse the full range in the cleanse and fast shop, or go straight to the Signature Cleanse, the Green Cleanse or the 1 Day Cleanse.

Related reading

• Do you lose weight on a cleanse?
• Is a juice cleanse worth it?
• The 1-day reset
• The weekend reset
• The 5-day cleanse
• Longer cleanses explained
• The green juice cleanse

By goal

• Juice for gut health

Related ingredient hubs

• Greens
• Celery
• Beetroot
• Carrot