IO Genix Synephrine - Bitter Orange Extract for Weight Loss

What is IO Genix Synephrine?

It is a single-ingredient supplement, in capsules, containing 330 mg of bitter orange dry extract (Citrus aurantium L.) standardised to 6%, that is 19.8 mg of p-synephrine per capsule. The bottle of 100 capsules, 58 g net, covers more than three months at one capsule a day.

P-synephrine is a molecule found naturally in the bitter orange fruit. To give a sense of scale: the manufacturer states that one litre of bitter orange juice contains between 15 and 27 mg of it, where a capsule delivers 19.8 mg in standardised form. That is the most useful comparison for understanding what you are buying.

The rest of the composition fits in three lines: a gelatine capsule shell, microcrystalline cellulose as a bulking agent and magnesium stearate as an anti-caking agent. As the capsule shell is made of gelatine, the product is suitable for neither vegetarians nor vegans. It joins our fat burners in capsules and IO Genix sections.

What is in one capsule?

Other ingredients: capsule shell (gelatine), bulking agent (microcrystalline cellulose), anti-caking agent (magnesium stearate). Pack size: 100 capsules, 58 g net. No energy value is declared and, at this scale, it is negligible.

A point of vocabulary first, because it accounts for half the comparison mistakes made in this category: 330 mg is the weight of the extract, 19.8 mg the weight of the active molecule. A label that advertises “500 mg of bitter orange” without giving a standardisation figure tells you nothing at all. It is the second number you should look for, every time.

That figure of 19.8 mg is anything but arbitrary, and it is the most important point on this page. ANSES has published an opinion on food supplements intended for athletes containing synephrine and recommends not exceeding 20 mg of synephrine per day, avoiding combination with caffeine and not consuming it during intense physical exercise. This product sits just under that limit, which is to its credit — but it also means there is no margin at all: one capsule only, never two, and nothing else alongside it.

On effects, the framework is unambiguous: no health claim is authorised in Europe for synephrine or for bitter orange. Not on weight, not on fat, not on energy, not on appetite. So you will read no promise here, not even one phrased indirectly. The “fat burner” label used in our sections is a commercial category name, not a description of an effect.

How do you take Synephrine?

Dose: 1 capsule a day, never more. Liquid: a large glass of water. When: in the morning on waking. How often: one intake a day. Duration: the manufacturer sets no precise duration but recommends a periodic break.

One discrepancy has to be flagged, and we will not pass over it in silence. The manufacturer suggests taking it “before training”; the ANSES opinion, on the contrary, recommends avoiding the consumption of synephrine during intense physical exercise. Between the two, we follow ANSES: take the capsule in the morning, well away from your session. That is the advice we give over the counter, and it deliberately differs from the leaflet.

Second instruction, and this one is absolute: never combine this product with another source of caffeine or stimulant without medical advice. That includes coffee, tea, energy drinks and above all pre-workouts, which commonly contain 200 to 350 mg of caffeine. The manufacturer says so, and so does ANSES: on this point there is no debate.

The manufacturer also advises against taking it late in the day, so as not to disturb sleep. With 100 capsules in the bottle, it covers more than three months — so plan the breaks it recommends rather than running through it without interruption.

Who is this product for, and who is it not for?

It is aimed at healthy adults engaged in a structured weight loss approach who want a single active ingredient with its standardisation stated. On that last point, the label is exemplary: one extract, one standardisation figure, one active molecule content.

The list of contraindications is one of the longest in the catalogue, and it needs to be read in full. The product is not recommended for pregnant or breastfeeding women, children and adolescents, people on medical treatment, or people suffering from cardiovascular disorders, hypertension, glaucoma, diabetes, prostate adenoma, depression or thyroid disorders. If any one of these applies to you, this product is not for you, and that is not negotiable.

It is suitable for neither vegetarians nor vegans, as the shell is made of gelatine. Traces of GLUTEN (wheat and oats), NUTS, PEANUT, EGG, MILK, FISH and SOYA are possible. Nor is it for you if you drink coffee during the day or already take a caffeinated pre-workout booster: stacking stimulants is precisely what the health authorities ask you to avoid.

What not to expect from it, and we will be blunt: this product does not make you lose weight. No claim exists, which means no European authority has validated any effect. Nor is it a pre-workout, or an appetite suppressant. If your calorie deficit is not in place, this bottle will change absolutely nothing.

Synephrine or a stimulant-free fat burner?

That is the real choice in this category, and it does not come down to effectiveness — neither family has an authorised claim — but to the balance between constraints and sensations.

A caffeine-free fat burner cannot be felt and imposes no constraints: no timing to respect, no stacking to watch, no cardiovascular contraindication. It is the better choice for the vast majority of people, and by far the safest. You will feel nothing at all, which is precisely the point.

Synephrine belongs to the other family, the actives with a stimulant effect, like the thermogenics in the fat burners section. It is only of interest in one specific case: you want a single active, dosed below the threshold recommended by ANSES, with no caffeine added to the formula — which leaves you in full control of your other intakes. That is a genuine advantage over a complete thermogenic in which caffeine is imposed on you.

The advice we actually give over the counter: if you drink coffee, walk on by. And if you are going to add a single supplement during a deficit, take a protein rather than a fat burner — protein contributes to the maintenance of muscle mass is an authorised claim, and that is what a diet really hinges on.

Frequently asked questions

Is 19.8 mg of p-synephrine a lot?

It is just under the threshold of 20 mg a day recommended by ANSES for synephrine in supplements intended for athletes. In other words: the dose is set at the maximum of what is advised, and there is no margin. One capsule a day, never two, and nothing else alongside it.

Can it be combined with a coffee or a pre-workout?

No. The manufacturer advises against it and ANSES recommends avoiding the combination of synephrine with caffeine. A pre-workout commonly delivers 200 to 350 mg of caffeine: stacking is exactly what should be avoided. On this specific point, there is no room for compromise.

Should it be taken before training?

The manufacturer suggests it, but ANSES recommends avoiding the consumption of synephrine during intense physical exercise. We follow ANSES: take the capsule in the morning, well away from your session. It is a deliberate departure from the leaflet, and we would rather explain it than keep quiet about it.

What is the difference between 330 mg and 19.8 mg?

The first figure is the weight of the plant extract, the second the weight of the p-synephrine it contains, at a standardisation of 6%. It is the second one you should compare from one product to another. A label that gives an extract weight without a standardisation figure allows no comparison at all.

How long does a bottle last?

More than three months, at one capsule a day for 100 capsules. The manufacturer recommends periodic breaks rather than uninterrupted use: plan them from the outset rather than running straight through to the last tablet.

Are the capsules suitable for vegetarians?

No, the shell is made of gelatine of animal origin. The contents, on the other hand, are indeed a plant extract of bitter orange. The manufacturer also reports possible traces of gluten, nuts, peanut, egg, milk, fish and soya.

Why are there so many contraindications?

Because synephrine is an active with a stimulant effect, structurally close to molecules that act on the cardiovascular system. The manufacturer rules out in particular cardiovascular disorders, hypertension, glaucoma, diabetes, prostate adenoma, depression and thyroid disorders. That list is not decorative: read it before buying.

Where to buy IO Genix Synephrine?

The bottle of 100 capsules can be ordered from this page, and we ship throughout France and Europe. Three months per bottle: this is a purchase that belongs to the long run, not to a moment of impulse.

At the Vendargues shop, about ten minutes from Montpellier, this is the product in front of which we ask three questions before selling: do you drink coffee, are you on any medication, and what time do you train? A single wrong answer is enough to put it back on the shelf, and that happens often. The rest of the range can be compared in our sports nutrition section.

Source: ANSES.