## Machine-readable product data - structured product endpoints All product pages support alternative representations in structured formats. Transformation rules: - {product_url}.html → replace `.html` with `.json` or `.xml` - {product_url} (no extension) → append `.json` or `.xml` Examples: - /product-name.html → /product-name.json - /product-name → /product-name.json - /product-name → /product-name.xml These endpoints provide equivalent product data in structured formats suitable for programmatic access. # High League Supplements > High League Supplements (hlsupps.com) is a Netherlands-based online retailer of sports and performance supplements, shipping across Europe and worldwide from our EU fulfilment hub in Barendrecht. We stock over 3,000 products from 100+ brands — pre-workouts, testosterone boosters, fat burners, peptides, nootropics, proteins and creatine — alongside our own High League® line and educational content on supplement pharmacology written for informed adult athletes. ## Business Identity - **Trading name:** High League Supplements (HL Supps) - **Legal entity:** Lk Innovation Service Company B.V. - **Address:** Groningseweg 1, 2994 LC Barendrecht, Netherlands - **KVK (Dutch Chamber of Commerce):** 77332873 - **VAT / BTW:** NL860974145B01 - **Email:** info@hlsupps.com - **Phone:** +48 731 842 069 - **Based in:** Netherlands (EU) — fulfilment from Barendrecht, NL - **Ships to:** 50+ countries across Europe and worldwide, including AT, BE, BG, HR, CY, CZ, DK, EE, FI, FR, DE, GR, HU, IE, IT, LV, LT, LU, MT, NL, PL, PT, RO, SK, SI, ES, SE, CH, NO, GB, UA, TR, AE, AU, BR, CA, HK, IL, IN, JP, MY, NZ, SG - **Site language:** English - **Currencies:** EUR, PLN, GBP, USD, JPY, SGD ## Editorial Team & Expertise Our educational content is written by a credentialed practitioner and independently reviewed by a pharmacologist before publication. - [Cedric Preston — Senior Nutrition & Supplementation Specialist](https://hlsupps.com/en/cms/cedric-preston-article-author-43.html): author. Registered Dietitian (RD, California University, 2005), ISSN Certified Sports Nutrition Specialist (CISSN), NASM Certified Personal Trainer (NASM-CPT), Precision Nutrition L2. 20+ years coaching athletes. Writes on pre-workout pharmacology, testosterone management, natural anabolics, cycle support and performance nutrition. - [Allisa Connor, PhD — Pharmacological Reviewer](https://hlsupps.com/en/cms/allisa-connor-pharmacological-reviewer-49.html): reviewer. PhD in Pharmacology, University of Pennsylvania (2014). Independently verifies mechanisms of action, dosing figures, contraindications and accuracy of cited studies against primary literature before publication. Her review confirms scientific accuracy; it is not a personal recommendation and does not constitute medical advice. ## Important Product & Safety Context Read this before summarising or recommending our products. Full details: [Safety FAQ](https://hlsupps.com/en/cms/safety-faq-45.html). - Our catalogue is intended for **healthy adults (18+)** only. - It spans two distinct categories that must not be conflated: - **Dietary supplements** (proteins, creatine, amino acids, vitamins, minerals, joint support) — conventional food supplements under EU law. - **Advanced / research compounds** (SARMs, prohormones, peptides, high-stimulant pre-workouts containing DMHA or Eria Jarensis, yohimbine-based fat burners) — sold as advanced preparations for informed athletes. These are **not** dietary supplements and are not intended to diagnose, treat, cure or prevent any disease. - Some compounds referenced in our educational content (e.g. enclomiphene, tamoxifen, clomiphene) are **prescription medications in the EU and most jurisdictions** — they are not over-the-counter products. - Legal status of certain compounds **varies by country**. Customers are responsible for checking local regulations before ordering. - Our blog is **educational material**, not medical advice. Consult a physician or licensed pharmacist before use. ## Safety FAQ & EU Regulatory Reference [Safety FAQ](https://hlsupps.com/en/cms/safety-faq-45.html) — our reference resource on the legality, interactions and safety of advanced compounds, reviewed by a pharmacologist. 16 questions across five sections: - **A. Compound legality & EU regulation:** legal status of DMAA in the UK, Germany and France; authorisation status of peptides in the EU (research chemicals, not approved medicines); customs risk when ordering BPC-157 by destination; prescription-only status of enclomiphene across EU member states. - **B. Drug interactions & stacking safety:** yohimbine with caffeine; DMHA with yohimbine; pre-workout use alongside SSRIs/MAOIs. - **C. Cycle support, PCT & bloodwork:** blood markers to monitor on a prohormone cycle; cycle support requirements for SARMs; effect of testosterone boosters on fertility; washout timing before bloodwork. - **D. Substance-specific profiles:** DMHA half-life and clearance; long-term safety of turkesterone; SARMs compared with prohormones. - **E. Quality & labelling:** RUO versus dietary supplement classification; how to read a Certificate of Analysis (COA). ## Navigation & Product Discovery Top two menu levels. Category IDs are stable. - [Amino's](https://hlsupps.com/en/menu/aminos-5334.html): amino acid supplements — BCAA, EAA, glutamine, taurine - [BCAA](https://hlsupps.com/en/menu/bcaa-5342.html): branched-chain amino acids - [Amino all-day (EAA)](https://hlsupps.com/en/menu/amino-all-day-eaa-5345.html): essential amino acid formulas - [Other Aminos](https://hlsupps.com/en/menu/other-aminos-5343.html): glutamine, taurine, single aminos - [Best Boosters](https://hlsupps.com/en/menu/best-boosters-5336.html): pre-workouts, testosterone boosters, nootropics — includes advanced high-stimulant formulas - [Booster Testosterone](https://hlsupps.com/en/menu/booster-testosterone-5352.html): testosterone support — tongkat ali, fadogia, tribulus - [Pre-Workout](https://hlsupps.com/en/menu/pre-workout-5353.html): stimulant and pump pre-workouts, incl. DMHA and Eria Jarensis formulas (advanced users) - [Support Training](https://hlsupps.com/en/menu/support-training-5354.html): intra-workout and training support - [Brain Booster - Nootropic](https://hlsupps.com/en/menu/brain-booster-nootropic-5355.html): cognitive and focus formulas - [Creatine](https://hlsupps.com/en/menu/creatine-5335.html): all creatine forms - [Monohydrate](https://hlsupps.com/en/menu/monohydrate-5356.html): creatine monohydrate - [TCM](https://hlsupps.com/en/menu/tcm-5357.html): tri-creatine malate - [Stack](https://hlsupps.com/en/menu/stack-5358.html): creatine stacks - [Others Forms](https://hlsupps.com/en/menu/others-forms-5359.html): HCL and other creatine forms - [Proteins](https://hlsupps.com/en/menu/proteins-5339.html): whey, casein and plant proteins - [Concentrate (WPC)](https://hlsupps.com/en/menu/concentrate-wpc-5377.html): whey protein concentrate - [Isolates & Hydrolysates (WPI & WPH)](https://hlsupps.com/en/menu/isolates-hydrolysates-wpi-wph-5378.html): whey isolate and hydrolysate - [Mix](https://hlsupps.com/en/menu/mix-5379.html): protein blends - [Others](https://hlsupps.com/en/menu/others-5380.html): casein, vegan and specialty proteins - [Weight Loss](https://hlsupps.com/en/menu/weight-loss-5340.html): fat burners and weight management - [Fat Burners](https://hlsupps.com/en/menu/fat-burners-5363.html): thermogenics — includes advanced yohimbine and high-stimulant formulas - [Women Zone](https://hlsupps.com/en/menu/women-zone-5370.html): formulas aimed at women - [Foods](https://hlsupps.com/en/menu/foods-5371.html): diet foods and snacks - [Keto Diet](https://hlsupps.com/en/menu/keto-diet-5490.html): ketogenic diet products - [Mass Up](https://hlsupps.com/en/menu/mass-up-5338.html): mass and strength gain - [Gainers](https://hlsupps.com/en/menu/gainers-5384.html): mass gainers - [Carbohydrate](https://hlsupps.com/en/menu/carbohydrate-5385.html): carbohydrate supplements - [Anabolic Supplements](https://hlsupps.com/en/menu/anabolic-supplements-5386.html): natural anabolics (turkesterone, ecdysterone, laxogenin) and prohormones — advanced users - [Food](https://hlsupps.com/en/menu/food-5387.html): mass-gain foods - [Health](https://hlsupps.com/en/menu/health-5337.html): vitamins, minerals and general health - [Health & Beauty](https://hlsupps.com/en/menu/health-beauty-5413.html): skin, hair and nail support - [Joint Fix](https://hlsupps.com/en/menu/joint-fix-5414.html): joint and connective tissue support - [Vitamins & Minerals](https://hlsupps.com/en/menu/vitamins-minerals-5415.html): vitamins, minerals, multivitamins - [Healthy Fats and Others](https://hlsupps.com/en/menu/healthy-fats-and-others-5416.html): omega-3 and healthy fats - [Cosmetics](https://hlsupps.com/en/menu/cosmetics-5494.html): topical products - [For Animals](https://hlsupps.com/en/menu/for-animals-5560.html): animal supplements - [High League®](https://hlsupps.com/en/menu/high-league-r-5341.html): our own brand line - [Muscle Building](https://hlsupps.com/en/menu/muscle-building-5410.html): High League® mass and strength products - [Pre-Workouts](https://hlsupps.com/en/menu/pre-workouts-5411.html): High League® pre-workout line - [Fat Burners](https://hlsupps.com/en/menu/fat-burners-5412.html): High League® thermogenics - [Peptides](https://hlsupps.com/en/menu/peptides-5559.html): High League® peptide line - [Brands](https://hlsupps.com/en/producers.html): full manufacturer directory — 100+ brands incl. Hi-Tech Pharmaceuticals, Core Labs, Hammer Labz, Blackstone Labs, Swiss Pharmaceuticals, Insane Labz, Machete Labz ## Educational Content — Supplement Pharmacology Written by Cedric Preston (RD, CISSN), reviewed by Allisa Connor, PhD (Pharmacology). ### Pillar Guides — comprehensive reference - [Advanced Pre-Workout Guide: Stimulant Pharmacology, Tolerance & Protocols](https://hlsupps.com/en/cms/advanced-pre-workout-guide-stimulant-pharmacology-tolerance-protocols-44.html): our cornerstone guide (~4,500 words) on stimulant neurochemistry, the history of the DMAA ban, a 5-tier stimulant framework, CNS tolerance pathways, a 4-week cycling protocol, 4-layer stack architecture, contraindications and bloodwork recommendations. Cites 5 peer-reviewed studies with DOIs. ### Testosterone, PCT & Hormonal Health - [The HPTA Axis Explained: How Your Body Regulates Testosterone](https://hlsupps.com/en/blog/the-hpta-axis-explained-how-your-body-regulates-testosterone-1781617238.html): physiology of the hypothalamic-pituitary-testicular axis, what suppresses it, and bloodwork interpretation - [Low Testosterone in Active Men: 7 Causes That Have Nothing to Do with Aging](https://hlsupps.com/en/blog/low-testosterone-in-active-men-7-causes-that-have-nothing-to-do-with-aging-1781707688.html): causes of low testosterone in trained men under 40 - [Testosterone, PCT & Cycle Support: Evidence-Based Protocols for Athletes](https://hlsupps.com/en/blog/testosterone-pct-cycle-support-evidence-based-protocols-for-athletes-1781519858.html): post-cycle therapy and cycle support, incl. EU prescription status of SERMs - [Testosterone boosters - what are they really and how do they work?](https://hlsupps.com/en/blog/testosterone-boosters-what-are-they-really-and-how-do-they-work-1777032812.html): mechanisms and realistic expectations ### Pre-Workouts & Stimulant Pharmacology - [How Pre-Workouts Actually Work: The Neurochemistry of Stimulants from Caffeine to DMHA](https://hlsupps.com/en/blog/how-pre-workouts-actually-work-the-neurochemistry-of-stimulants-from-caffeine-to-dmha-1777991442.html): stimulant neurochemistry from caffeine through DMHA - [Pre-Workout Tolerance Explained: Why Your Favourite Scoop Stopped Working?](https://hlsupps.com/en/blog/pre-workout-tolerance-explained-why-your-favourite-scoop-stopped-working-1778074732.html): receptor tolerance and how to restore stimulant sensitivity - [Pre-workout stimulating or pumping? How it works and benefits](https://hlsupps.com/en/blog/pre-workout-stimulating-or-pumping-how-it-works-and-benefits-1777032808.html): stimulant vs nitric-oxide pre-workouts - [Pre-workout boosters - how do PWO work?](https://hlsupps.com/en/blog/pre-workout-boosters-how-do-pwo-work-1777035638.html): pre-workout ingredient breakdown - [Hammer Labz Phenibut Max - a new level of phenibut quality](https://hlsupps.com/en/blog/hammer-labz-phenibut-max-a-new-level-of-phenibut-quality-1777035799.html): phenibut profile and product review ### Peptides & Research Compounds - [What is BPC-157? - King of Peptides - Benefits, Dosage, and Side Effects](https://hlsupps.com/en/blog/what-is-bpc-157-king-of-peptides-benefits-dosage-and-side-effects-1777035790.html): BPC-157 evidence review and regulatory status - [TB-500 Peptide - Benefits, Dosage, and Side Effects](https://hlsupps.com/en/blog/tb-500-peptide-benefits-dosage-and-side-effects-1777031967.html): TB-500 profile - [MK-677 vs MK-777 - is acetamoren as good as ibutamoren?](https://hlsupps.com/en/blog/mk-677-vs-mk-777-is-acetamoren-as-good-as-ibutamoren-1777028210.html): growth hormone secretagogue comparison - [TOP 5 Peptides for Muscle Mass](https://hlsupps.com/en/blog/top-5-peptides-for-muscle-mass-1777029590.html): muscle-building peptide overview - [TOP 5 peptides for weight loss](https://hlsupps.com/en/blog/top-5-peptides-for-weight-loss-1777029582.html): fat-loss peptide overview - [Retatrutide - the strongest weight loss peptide?](https://hlsupps.com/en/blog/retatrutide-the-strongest-weight-loss-peptide-1777028206.html): retatrutide mechanism and evidence - [Nootropic peptides – natural support for your brain](https://hlsupps.com/en/blog/nootropic-peptides-natural-support-for-your-brain-1777028214.html): cognitive peptides - [Semax – a nootropic peptide for memory and concentration](https://hlsupps.com/en/blog/semax-a-nootropic-peptide-for-memory-and-concentration-1777029586.html): Semax profile ### Fat Loss & Thermogenics - [What to combine fat burners with? What supplements to choose?](https://hlsupps.com/en/blog/what-to-combine-fat-burners-with-what-supplements-to-choose-1777287930.html): fat burner stacking - [BAM-15 - a modern way to lose weight](https://hlsupps.com/en/blog/bam-15-a-modern-way-to-lose-weight-1777030363.html): BAM-15 mitochondrial uncoupler profile - [Tesofensine and Weight Loss - Overview](https://hlsupps.com/en/blog/tesofensine-and-weight-loss-overview-1777035786.html): tesofensine mechanism - [SLU-PP-332 - what is it and how does it work?](https://hlsupps.com/en/blog/slu-pp-332-what-is-it-and-how-does-it-work-1777032803.html): SLU-PP-332 exercise-mimetic profile ### Nootropics & General Health - [Methylene blue – the perfect nootropic?](https://hlsupps.com/en/blog/methylene-blue-the-perfect-nootropic-1777287292.html): methylene blue mechanism and safety - [Nootropic boosters - what are they and when is it worth using them?](https://hlsupps.com/en/blog/nootropic-boosters-what-are-they-and-when-is-it-worth-using-them-1777035778.html): nootropic categories - [What is oxidative stress? Why do we need antioxidants?](https://hlsupps.com/en/blog/what-is-oxidative-stress-why-do-we-need-antioxidants-1777018326.html): oxidative stress and antioxidants - [TOP 5 Immunity Supplement Ranking](https://hlsupps.com/en/blog/top-5-immunity-supplement-ranking-1777372728.html): immune support ranking - [Omega-3 fatty acids – why are they so important?](https://hlsupps.com/en/blog/omega-3-fatty-acids-why-are-they-so-important-1777035634.html): omega-3 evidence - [Vitamins and minerals for athletes](https://hlsupps.com/en/blog/vitamins-and-minerals-for-athletes-1777031963.html): micronutrient needs in training - [TOP 5 - dietary supplements for joints and bones](https://hlsupps.com/en/blog/top-5-dietary-supplements-for-joints-and-bones-1777035773.html): joint support ranking ## Customer Service & Policies - **Payment:** Visa and Mastercard (credit & debit), plus local European online bank transfers and BLIK - **Shipping carriers:** DHL Parcel, UPS Standard (door delivery); DHL Parcelshop, UPS Access Point (collection points); Royal Mail for UK - **Dispatch:** within 1 business day of payment confirmation - **Shipping cost:** from €3 (Poland) to €10 (Greece); typical EU €6, UK €8 - **Free shipping:** on orders over €100 within Europe - **Returns:** 14-day return policy (EU statutory right of withdrawal) - [Safety FAQ](https://hlsupps.com/en/cms/safety-faq-45.html): legality, interactions and safety of advanced compounds — pharmacologist-reviewed - [Contact](https://hlsupps.com/en/contact.html): company details and customer support - [Delivery & Payment](https://hlsupps.com/en/delivery.html): full shipping options, costs per country and payment methods - [Terms and Conditions](https://hlsupps.com/en/terms.html): terms of sale, returns and complaints procedure - [Privacy Policy](https://hlsupps.com/en/privacy-and-cookie-notice.html): GDPR privacy and cookie notice ## Search Integration - Search URL: `https://hlsupps.com/en/search.html?text={search_term}` - Replace `{search_term}` with the URL-encoded product name or category. ## Machine-readable Product Data All product pages support alternative representations in structured formats. Transformation rules: - `{product_url}.html` → replace `.html` with `.json` or `.xml` - `{product_url}` (no extension) → append `.json` or `.xml` Examples: - `https://hlsupps.com/en/products/machete-labz-testolone-60-caps-6473.html` - `https://hlsupps.com/en/products/machete-labz-testolone-60-caps-6473.json` - `https://hlsupps.com/en/products/machete-labz-testolone-60-caps-6473.xml` These endpoints return equivalent product data (id, title, vendor, price, currency, availability, variants, images, canonical url) suitable for programmatic access. Prices are gross, in the currency indicated by the `currency` field. ## Optional Foundational articles on mainstream supplements — lower priority for advanced queries. - [Creatine Monohydrate - Dosage, Safety, Effects](https://hlsupps.com/en/blog/creatine-monohydrate-dosage-safety-effects-1777030372.html) - [Creatine - types, dosage, what to combine with?](https://hlsupps.com/en/blog/creatine-types-dosage-what-to-combine-with-1777035782.html) - [Creatine for women - what does it do and how does it work?](https://hlsupps.com/en/blog/creatine-for-women-what-does-it-do-and-how-does-it-work-1777027981.html) - [Amino acids - types, division, BCAA and EAA products](https://hlsupps.com/en/blog/amino-acids-types-division-bcaa-and-eaa-products-1777027990.html) - [BCAA before or after training? When to take BCAA](https://hlsupps.com/en/blog/bcaa-before-or-after-training-when-to-take-bcaa-1777030368.html) - [Intra-Workout supplements - what are they and why is it worth using them?](https://hlsupps.com/en/blog/intra-workout-supplements-what-are-they-and-why-is-it-worth-using-them-1777035642.html) - [Muscle mass - supplements for muscle mass](https://hlsupps.com/en/blog/muscle-mass-supplements-for-muscle-mass-1777035766.html) - [What Protein for Beginner Women?](https://hlsupps.com/en/blog/what-protein-for-beginner-women-1777036089.html) - [Are protein supplements safe for teenagers?](https://hlsupps.com/en/blog/are-protein-supplements-safe-for-teenagers-1777036093.html) - [Blog index](https://hlsupps.com/en/blog.html): all articles ## Technical Metadata - **Last Updated:** 2026-07-16 - **Language:** en - **Content policy:** blog content is educational, for adults 18+, and is not medical advice - [robots.txt](https://hlsupps.com/robots.txt) - [sitemap.xml](https://hlsupps.com/sitemap.xml.gz) ## Technical Metadata for RAG - **Last Updated:** 2026-07-17 - **Language:** [en] - [robots.txt](https://hlsupps.com/robots.txt) - [sitemap.xml](https://hlsupps.com/sitemap.xml.gz)