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Moderate evidenceWeight management

Spinach Extract (Thylakoids)

Membrane fragments from spinach leaves that slow fat digestion and prolong satiety signalling. Trials consistently show less hunger after a meal; whether that translates into weight loss is much less clear.

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What the science says

  • Reduced hunger and increased fullness Moderate evidence

    A systematic review and dose-response meta-analysis of randomized controlled trials found thylakoid supplementation taken with meals significantly reduced hunger ratings, with doses around 5–7.4 g/day performing best. The absolute change on the visual analogue scale was small.

  • Cravings for palatable food Limited evidence

    A randomized trial in overweight women found thylakoid-rich spinach extract reduced hunger, increased satiety and lowered cravings for sweet foods. It was a small single-centre study with mostly self-reported outcomes.

  • Actual weight loss Limited evidence

    An acute randomized crossover trial confirmed the satiety effect after a single dose but did not measure long-term weight. No adequately powered long-term trial has shown that the appetite effect produces meaningful weight loss.

Dosage & safety

Studied dose5 g of thylakoid-rich spinach extract taken with a meal, typically once daily before the largest meal, is the most-studied dose.
SafetyWell tolerated in short trials; mild bloating is the main complaint. High in vitamin K, so it can interfere with warfarin. Spinach is high in oxalate, which matters for people prone to kidney stones.

How to take it

TimingOnce daily with the largest meal of the day, which is how the trials dosed it.
With food?Take it with the meal — it works by slowing fat digestion, so it has to be in the stomach alongside the food.
Worth knowingThe powder needs to be stirred into food or a drink; swallowed dry in capsules it cannot mix with the meal the way the trials intended.

Interactions

With medications

  • warfarin and other vitamin K antagonists

    Thylakoid extract is concentrated from spinach and carries a large vitamin K load that blunts warfarin. do not start or stop it without telling the clinic managing your INR

With other supplements

  • iron and calcium supplements

    Spinach oxalate binds both minerals in the gut and reduces absorption. separate by at least 2 hours

Well-established interactions only — this is not a complete list. Always tell your doctor and pharmacist what you take.

Frequently asked questions

Do spinach thylakoids reduce hunger?

Spinach thylakoid extract has moderate evidence for reducing hunger: a meta-analysis of randomised trials found it lowered hunger ratings when taken with meals, best at around 5–7.4 g/day. The absolute change was small.

Do spinach thylakoids help you lose weight?

No adequately powered long-term trial has shown that spinach thylakoids' appetite effect produces meaningful weight loss, so the evidence for weight loss is limited. One small trial in overweight women found thylakoids also lowered cravings for sweet foods.

How should I take spinach extract thylakoids?

The most-studied dose is 5 g of thylakoid-rich spinach extract once daily with your largest meal, stirred into food or a drink. Thylakoids work by slowing fat digestion, so they need to be in the stomach with the meal.

Can I take spinach thylakoids with warfarin?

Spinach thylakoid extract carries a large vitamin K load that blunts warfarin, so do not start or stop it without telling the clinic managing your INR. Spinach is also high in oxalate, which matters if you are prone to kidney stones.

Scientific references

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