{"title":"Nitric Oxide Supplements","description":"\u003cp\u003eCompare citrulline, arginine, AAKG and beetroot nitrate products on the amount of each ingredient per serving and the cost per serving. Research on these ingredients shows small or mixed effects, so we describe what's in them rather than what they promise.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/performance-strength\"\u003eAll gym \u0026amp; sports performance\u003c\/a\u003e · \u003ca href=\"\/collections\/citrulline-pump-formulas\"\u003eCitrulline\u003c\/a\u003e · \u003ca href=\"\/collections\/pump-supplements\"\u003ePump supplements\u003c\/a\u003e · \u003ca href=\"\/collections\/stim-free-pre-workout\"\u003eStim-free pre-workout\u003c\/a\u003e · \u003ca href=\"\/collections\/pre-workout\"\u003ePre-workout\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eWhat are nitric oxide supplements?\u003c\/h2\u003e\n\u003cp\u003e\"Nitric oxide supplements\" is the name people search for products containing citrulline, arginine (including AAKG, arginine alpha-ketoglutarate) or dietary nitrate from beetroot. Nitric oxide is a molecule the body makes itself; these products contain ingredients involved in that process, but we don't claim any of them raises nitric oxide or improves your training.\u003c\/p\u003e\n\u003cp\u003eNone of these ingredients has an authorised health claim in Great Britain, and the government says \u003ca href=\"https:\/\/www.gov.uk\/government\/publications\/great-britain-nutrition-and-health-claims-nhc-register\"\u003eonly authorised claims in the GB register may be used\u003c\/a\u003e. So we describe the ingredients and the research.\u003c\/p\u003e\n\u003ch2\u003eWhat does the research on citrulline, arginine and nitrate show?\u003c\/h2\u003e\n\u003cp\u003eThe effects reported are small or mixed. A 2019 meta-analysis found \u003ca href=\"https:\/\/scholars.duke.edu\/publication\/1687478\"\u003ea small benefit for citrulline over placebo on strength and power\u003c\/a\u003e, and a 2020 meta-analysis of arginine reported possible positive effects on test results but \u003ca href=\"https:\/\/www.mdpi.com\/2072-6643\/12\/5\/1300\"\u003efound signs of publication bias in the endurance data\u003c\/a\u003e (meaning studies with positive results may be more likely to be published), so its authors advised caution.\u003c\/p\u003e\n\u003cp\u003eFor dietary nitrate, a 2016 meta-analysis found \u003ca href=\"https:\/\/link.springer.com\/article\/10.1007\/s40279-016-0617-7\"\u003ea small positive effect on how long people could keep exercising, but less effect on time trials\u003c\/a\u003e. An earlier review found effects were \u003ca href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/23580439\/\"\u003emore often seen in inactive to recreationally active people\u003c\/a\u003e than in trained athletes.\u003c\/p\u003e\n\u003ch2\u003eHow do you compare these products?\u003c\/h2\u003e\n\u003cp\u003eCheck which ingredient you're buying, how much is in each serving, and whether the product also contains caffeine. Citrulline malate contains less citrulline per gram than L-citrulline, so compare the citrulline content.\u003c\/p\u003e\n\u003cp\u003eIf a product contains caffeine, EFSA (the European Food Safety Authority) says healthy adults can have \u003ca href=\"https:\/\/www.efsa.europa.eu\/en\/topics\/topic\/caffeine\"\u003esingle doses up to 200mg and up to 400mg a day\u003c\/a\u003e from all sources. If you take blood-pressure medication or any other medicine, or are pregnant or breastfeeding, speak to your GP or pharmacist first. More detail on our \u003ca href=\"\/collections\/citrulline-pump-formulas\"\u003ecitrulline\u003c\/a\u003e page.\u003c\/p\u003e\n\u003chr\u003e\n\u003cp\u003e\u003cem\u003eWe sell the products on this page. That's our commercial interest, and it's why we show the evidence alongside them. This page is \u003ca href=\"\/pages\/health-information-disclaimer\"\u003egeneral information for adults, not personalised medical advice\u003c\/a\u003e. Food supplements should not replace a varied, balanced diet.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eWritten by \u003ca href=\"\/pages\/about-us\"\u003eAndy Arshad\u003c\/a\u003e, SupplementHQ. Last reviewed 11 October 2026.\u003c\/em\u003e\u003c\/p\u003e","products":[{"product_id":"applied-nutrition-abe-pump","title":"Applied Nutrition ABE Pump","description":"\u003cp\u003eApplied Nutrition ABE Pump is the stimulant-free version of ABE. There is no caffeine in it, which makes it a genuine option for evening training, and it stacks with a stimulant pre-workout if you want both.\u003c\/p\u003e\n\u003cp\u003eThe formula centres on citrulline — check the label for the amount per serving.\u003c\/p\u003e\n\u003ch3\u003eWhy choose it\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCompletely stimulant-free — no caffeine\u003c\/li\u003e\n\n\u003cli\u003eStacks with a caffeinated pre-workout if you want energy too\u003c\/li\u003e\n\u003cli\u003e500g tub in five flavours\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to use\u003c\/h3\u003e\n\u003cp\u003eMix one scoop with 400–500ml of cold water and take 20–30 minutes before training. Can be combined with a stimulant pre-workout.\u003c\/p\u003e","brand":"Applied Nutrition","offers":[{"title":"500g \/ Blue Razz","offer_id":58283643699531,"sku":"5056555204290","price":27.94,"currency_code":"GBP","in_stock":true},{"title":"500g \/ Red Hawaiian","offer_id":58283643732299,"sku":"5056555204306","price":27.94,"currency_code":"GBP","in_stock":true},{"title":"500g \/ Slush Puppie","offer_id":58283643765067,"sku":"5056555211526","price":27.94,"currency_code":"GBP","in_stock":true},{"title":"500g \/ Slush Puppie Twisted Citrus","offer_id":58283643797835,"sku":"5056555214732","price":27.94,"currency_code":"GBP","in_stock":true},{"title":"500g \/ Tigers Blood","offer_id":58283643830603,"sku":"5056555204313","price":27.94,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1077\/4937\/6331\/files\/image_2026-04-15_69df70bf716e9.jpg?v=1787910438"},{"product_id":"applied-nutrition-abe-pump-shot","title":"Applied Nutrition ABE Pump Shot","description":"\u003cp\u003eABE Pump Shot is the stimulant-free ABE Pump formula in a ready-to-drink 100ml shot. No caffeine, so it is an option if you train late and want to avoid caffeine.\u003c\/p\u003e\n\n\u003ch3\u003eWhy choose it\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eStimulant-free pump formula, ready to drink\u003c\/li\u003e\n\u003cli\u003eNo caffeine\u003c\/li\u003e\n\u003cli\u003eStacks with any caffeinated pre-workout\u003c\/li\u003e\n\u003cli\u003eBox of 12 x 100ml shots\u003c\/li\u003e\n\u003cli\u003eNothing to mix\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to use\u003c\/h3\u003e\n\u003cp\u003eDrink one shot 20–30 minutes before training. Can be combined with a stimulant pre-workout.\u003c\/p\u003e","brand":"Applied Nutrition","offers":[{"title":"12 x 100ml \/ Cherry Cola","offer_id":58283647598923,"sku":"5056555211588","price":21.8,"currency_code":"GBP","in_stock":true},{"title":"12 x 100ml \/ Citrus Twist","offer_id":58283647631691,"sku":"5056555211595","price":21.8,"currency_code":"GBP","in_stock":true},{"title":"12 x 100ml \/ Strawberry Lime","offer_id":58283647664459,"sku":"5056555211601","price":21.8,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1077\/4937\/6331\/files\/image_2025-11-27_6928203914b8d.jpg?v=1787910469"},{"product_id":"ostrovit-a-akg","title":"OstroVit A-AKG","description":"\u003cp\u003eOstroVit A-AKG is pure arginine alpha-ketoglutarate — a single-ingredient nitric oxide precursor with no caffeine, no proprietary blend and nothing else in the tub.\u003c\/p\u003e\n\u003cp\u003eBecause it is stimulant-free, it suits evening sessions and stacks with anything.\u003c\/p\u003e\n\u003ch3\u003eWhy choose it\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePure A-AKG — no fillers, no stimulants\u003c\/li\u003e\n\n\u003cli\u003eCaffeine-free, so it works at any time of day\u003c\/li\u003e\n\u003cli\u003eStacks with a pre-workout, creatine or anything else\u003c\/li\u003e\n\u003cli\u003e200g tub — Lemon, Orange or unflavoured Natural\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to use\u003c\/h3\u003e\n\u003cp\u003eMix one serving with 200–300ml of water and take 30 minutes before training on an empty stomach.\u003c\/p\u003e","brand":"OstroVit","offers":[{"title":"200g \/ Lemon","offer_id":58283658182987,"sku":"5902232611618","price":9.37,"currency_code":"GBP","in_stock":true},{"title":"200g \/ Natural (Unflavoured)","offer_id":58283658215755,"sku":"5902232610314","price":9.37,"currency_code":"GBP","in_stock":true},{"title":"200g \/ Orange","offer_id":58283658248523,"sku":"5902232610321","price":9.37,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1077\/4937\/6331\/files\/image_2025-02-14_67af2965291ed.jpg?v=1787910707"},{"product_id":"trec-nutrition-aakg-powder","title":"Trec Nutrition AAKG Powder","description":"\u003cp\u003eTrec Nutrition AAKG Powder is a single-ingredient arginine alpha-ketoglutarate supplement in a 240g tub. No stimulants, no blends — just the nitric oxide precursor.\u003c\/p\u003e\n\n\u003ch3\u003eWhy choose it\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePure AAKG powder — no stimulants or fillers\u003c\/li\u003e\n\u003cli\u003eContains arginine — see the label for amounts per serving\u003c\/li\u003e\n\u003cli\u003eCaffeine-free, suitable for evening training\u003c\/li\u003e\n\u003cli\u003eMixes into water in seconds\u003c\/li\u003e\n\u003cli\u003e240g tub in three flavours\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to use\u003c\/h3\u003e\n\u003cp\u003eMix one serving with 200–300ml of water and take 30 minutes before training, ideally on an empty stomach.\u003c\/p\u003e","brand":"Trec Nutrition","offers":[{"title":"240g \/ Grapefruit","offer_id":58283659100491,"sku":"5902114040376","price":16.99,"currency_code":"GBP","in_stock":true},{"title":"240g \/ Lemon","offer_id":58283659133259,"sku":"5902114040383","price":16.99,"currency_code":"GBP","in_stock":true},{"title":"240g \/ Orange","offer_id":58283659166027,"sku":"5902114040390","price":16.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1077\/4937\/6331\/files\/image_2022-03-03_6220a90882214.jpg?v=1787910720"},{"product_id":"biotechusa-aakg-shock-extreme","title":"BioTechUSA AAKG Shock Extreme","description":"\u003cp\u003eBioTechUSA AAKG Shock Extreme is a liquid arginine formula in a 1-litre bottle — no powder, no shaker, just measure and drink.\u003c\/p\u003e\n\u003cp\u003eLiquid delivery means there is nothing to dissolve and nothing left in the bottom of the cup. It is stimulant-free, so it fits before any session regardless of time of day.\u003c\/p\u003e\n\u003ch3\u003eWhy choose it\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eLiquid AAKG — nothing to mix\u003c\/li\u003e\n\u003cli\u003eContains arginine — see the label for amounts per serving\u003c\/li\u003e\n\u003cli\u003eCaffeine-free, suitable for evening training\u003c\/li\u003e\n\u003cli\u003e1-litre bottle in Cherry or Orange\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to use\u003c\/h3\u003e\n\u003cp\u003eMeasure one serving using the cap and take 30 minutes before training. Refrigerate after opening.\u003c\/p\u003e","brand":"BioTechUSA","offers":[{"title":"1000ml \/ Cherry","offer_id":58283660443979,"sku":"5999076200320","price":26.63,"currency_code":"GBP","in_stock":true},{"title":"1000ml \/ Orange","offer_id":58283660476747,"sku":"5999076200337","price":26.63,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1077\/4937\/6331\/files\/image_2022-07-07_62c6d29332a7c.jpg?v=1787910736"},{"product_id":"biotechusa-aakg-1000","title":"BioTechUSA AAKG 1000","description":"\u003cp\u003eBioTechUSA AAKG 1000 delivers arginine alpha-ketoglutarate in tablet form — the simplest way to take it if you would rather not add another powder to your routine.\u003c\/p\u003e\n\u003cp\u003eStimulant-free, so it can be taken any time.\u003c\/p\u003e\n\u003ch3\u003eWhy choose it\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eArginine AKG in convenient tablet form\u003c\/li\u003e\n\u003cli\u003eContains arginine — see the label for amounts per serving\u003c\/li\u003e\n\u003cli\u003eNo mixing, no taste, no shaker\u003c\/li\u003e\n\u003cli\u003eCaffeine-free — take before any session\u003c\/li\u003e\n\u003cli\u003e100 tablets per bottle\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to use\u003c\/h3\u003e\n\u003cp\u003eTake as directed on the label, around 30 minutes before training, with water.\u003c\/p\u003e","brand":"BioTechUSA","offers":[{"title":"100 tablets","offer_id":58283661230411,"sku":"5999076204465","price":14.29,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1077\/4937\/6331\/files\/image_2025-03-17_67d827b634a63.jpg?v=1787910750"},{"product_id":"scitec-nutrition-aakg","title":"Scitec Nutrition AAKG","description":"\u003cp\u003eScitec Nutrition AAKG provides 800mg of arginine alpha-ketoglutarate per capsule — a straightforward, stimulant-free nitric oxide precursor with nothing else added.\u003c\/p\u003e\n\u003cp\u003eCapsules make it easy to stack alongside a pre-workout without adding another scoop, and easy to take with you.\u003c\/p\u003e\n\u003ch3\u003eWhy choose it\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e800mg AAKG per capsule\u003c\/li\u003e\n\u003cli\u003eContains arginine — see the label for amounts per serving\u003c\/li\u003e\n\u003cli\u003eNo taste, no mixing — easy to stack with anything\u003c\/li\u003e\n\u003cli\u003eCaffeine-free\u003c\/li\u003e\n\u003cli\u003e100 capsules per bottle\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to use\u003c\/h3\u003e\n\u003cp\u003eTake as directed on the label, around 30 minutes before training, with water.\u003c\/p\u003e","brand":"Scitec Nutrition","offers":[{"title":"100 caps","offer_id":58283662311755,"sku":"5999100033054","price":14.63,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1077\/4937\/6331\/files\/image_2023-12-15_657c1cac2a95f.jpg?v=1787910763"},{"product_id":"olimp-nutrition-aakg-xplode","title":"Olimp Nutrition AAKG Xplode","description":"\u003cp\u003eOlimp Nutrition AAKG Xplode is an arginine alpha-ketoglutarate powder. There is no caffeine in it, so it works before an evening session and stacks cleanly with a stimulant pre-workout if you want both.\u003c\/p\u003e\n\n\u003ch3\u003eWhy choose it\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eContains arginine — see the label for amounts per serving\u003c\/li\u003e\n\u003cli\u003eCompletely stimulant-free\u003c\/li\u003e\n\u003cli\u003eStacks with any pre-workout\u003c\/li\u003e\n\u003cli\u003e300g tub, Orange flavour\u003c\/li\u003e\n\u003cli\u003eFrom one of Europe's longest-established sports nutrition brands\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to use\u003c\/h3\u003e\n\u003cp\u003eMix one serving with 200–300ml of water and take 30 minutes before training.\u003c\/p\u003e","brand":"Olimp Nutrition","offers":[{"title":"300g \/ Orange","offer_id":58283664048459,"sku":"5901330057991","price":27.69,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1077\/4937\/6331\/files\/image_2017-08-24_599ee5a62915b.jpg?v=1787910778"},{"product_id":"conteh-sports-mega-pump-elite","title":"Conteh Sports Mega Pump Elite","description":"\u003cp\u003eConteh Sports Mega Pump Elite is a stimulant-free pre-workout with no caffeine. That makes it an option for evening training, or for adding to a pre-workout you already use without taking more caffeine.\u003c\/p\u003e\n\u003ch3\u003eWhy choose it\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eStimulant-free — no caffeine at all\u003c\/li\u003e\n\n\u003cli\u003eIdeal for evening sessions\u003c\/li\u003e\n\u003cli\u003eCan be stacked with a caffeinated pre-workout\u003c\/li\u003e\n\u003cli\u003e390g tub, five flavours\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to use\u003c\/h3\u003e\n\u003cp\u003eMix one scoop with 400–500ml of cold water 20–30 minutes before training. Can be combined with a stimulant pre-workout.\u003c\/p\u003e","brand":"Conteh Sports","offers":[{"title":"390g \/ Cherry","offer_id":58283724046667,"sku":"619091690672","price":35.99,"currency_code":"GBP","in_stock":false},{"title":"390g \/ Fruit Burst","offer_id":58283724079435,"sku":"619091690696","price":35.99,"currency_code":"GBP","in_stock":true},{"title":"390g \/ Grape","offer_id":58283724112203,"sku":"619091690719","price":35.99,"currency_code":"GBP","in_stock":true},{"title":"390g \/ Peach","offer_id":58283724144971,"sku":"619091690702","price":35.99,"currency_code":"GBP","in_stock":true},{"title":"390g \/ Raspberry Twist","offer_id":58283724177739,"sku":"619091690689","price":35.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1077\/4937\/6331\/files\/image_2025-11-04_6909b7a620747.jpg?v=1787911453"},{"product_id":"scitec-nutrition-ami-no-xpress","title":"Scitec Nutrition Ami-NO Xpress","description":"\u003cp\u003eScitec Nutrition Ami-NO Xpress is an amino acid powder with added arginine. It is stimulant-free, which makes it a sensible intra-workout option that will not stack caffeine on top of whatever pre-workout you already take.\u003c\/p\u003e\n\u003ch3\u003eWhy choose it\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAmino acids plus arginine in one formula — see the label for amounts per serving\u003c\/li\u003e\n\n\u003cli\u003eStimulant-free — no caffeine\u003c\/li\u003e\n\u003cli\u003e440g tub\u003c\/li\u003e\n\u003cli\u003eOrange Mango and Peach Ice Tea\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to use\u003c\/h3\u003e\n\u003cp\u003eMix one scoop with 400–500ml of cold water and take before or during training.\u003c\/p\u003e","brand":"Scitec Nutrition","offers":[{"title":"440g \/ Orange Mango","offer_id":58284302598475,"sku":"5999100032620","price":27.99,"currency_code":"GBP","in_stock":true},{"title":"440g \/ Peach Ice Tea","offer_id":58284302631243,"sku":"5999100032637","price":27.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1077\/4937\/6331\/files\/image_2023-07-21_64ba4a9a6c316.jpg?v=1787913645"},{"product_id":"animal-pump","title":"Animal Pump","description":"\u003cp\u003eAnimal Pump is one of the longest-running pre-workouts on the market, and it works differently from most: instead of a tub and a scoop, you get 30 foil packs, each holding a complete daily dose in capsule form.\u003c\/p\u003e\n\u003cp\u003eThe pack combines nitric oxide support with a creatine matrix and antioxidants — a full pre-workout stack rather than a single blend, with a stimulant capsule you can simply leave out if you are training late.\u003c\/p\u003e\n\u003ch3\u003eWhy choose it\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e30 pre-portioned daily packs — no scooping, no measuring\u003c\/li\u003e\n\u003cli\u003eNitric oxide and creatine support in one dose\u003c\/li\u003e\n\u003cli\u003eSeparate stimulant cap you can omit for evening training\u003c\/li\u003e\n\u003cli\u003eCapsules, so nothing to mix or taste\u003c\/li\u003e\n\u003cli\u003eA long-standing staple of the Animal range\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to use\u003c\/h3\u003e\n\u003cp\u003eTake one pack 30–45 minutes before training with water. Omit the red stimulant capsule if training late in the day.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eContains caffeine. Not suitable for children, or people sensitive to caffeine, pregnant or breastfeeding.\u003c\/em\u003e\u003c\/p\u003e","brand":"Animal","offers":[{"title":"30 packs","offer_id":58284318163275,"sku":"039442130501","price":63.99,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1077\/4937\/6331\/files\/image_2026-01-13_696645dd9f3a0.jpg?v=1787913668"},{"product_id":"apex-formulas-apex-pump","title":"Apex Formulas Apex Pump","description":"\u003cp\u003eApex Pump is a stimulant-free pump formula in a generous 625g tub. 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