# Sourcing Quality Aspirin Aspirin looks simple. It is not. Formulation, dose, and what else sits in the tablet all affect predictability and safety. ### What to look for 1. plain **single-ingredient aspirin** 2. the exact dose the protocol or discussion is based on 3. no added **paracetamol**, **codeine**, **caffeine**, or extra **NSAIDs** 4. intact packaging with no moisture exposure 5. tablets stored in a cool, dry place ### Formulation: plain vs enteric-coated Plain aspirin dissolves in the stomach and is absorbed more predictably. Enteric-coated aspirin is designed to pass through the stomach and dissolve later in the small intestine. Enteric coating was meant to reduce stomach irritation. In practice, enteric coating does **not** reliably prevent gastrointestinal bleeding. It can also make absorption less consistent. [GoodRx: What Is Aspirin?](https://www.goodrx.com/aspirin/what-is) For oncology-oriented use, plain low-dose aspirin is usually the cleaner fit because most of the relevant literature is built around standard low-dose aspirin exposure rather than delayed-release uncertainty. ### Dose: low-dose vs standard-dose Low-dose aspirin usually means **75 to 100 mg daily**. That range is used in cancer prevention studies and in most adjunct oncology discussion. It works mainly through irreversible **COX-1** inhibition and lower platelet **thromboxane A2** production. Standard analgesic doses, usually **300 to 600 mg or more**, are a different use case. They are used for pain and fever. They are not the dose most oncology protocols are built around. Australian colorectal-cancer prevention guidance discusses aspirin in the **100 to 300 mg daily** range. Higher doses also bring more **COX-2** inhibition and anti-inflammatory effect, but they bring more gastrointestinal risk as well. ### Generic equivalence and storage Generic aspirin and branded aspirin use the same active ingredient, **acetylsalicylic acid**. For standard use, they are therapeutically equivalent. Storage matters more than branding. Aspirin hydrolyses when exposed to moisture. That shortens shelf life and reduces product quality. Store it in a cool, dry place and keep it away from bathroom humidity. If tablets smell strongly vinegary, they have likely broken down and should be discarded. ### Avoiding combination products Combination products are the most important sourcing mistake to avoid. Many over-the-counter pain products combine aspirin with other ingredients such as **paracetamol**, **codeine**, **caffeine**, or another **NSAID**. These are not a good fit for daily oncology-oriented use because: * they add unnecessary interaction burden * extra **NSAIDs** increase bleeding risk * codeine products add their own safety and regulatory issues Concurrent NSAID use can raise bleeding risk significantly. The cleanest label is simple: **Active ingredient: aspirin 100 mg** or **acetylsalicylic acid 100 mg** ### Practical takeaway The best aspirin product is usually the least complicated one. Choose plain, single-ingredient, low-dose aspirin from a reliable supplier. Avoid delayed-release uncertainty unless there is a specific reason to use it. Avoid mixed pain formulas completely. ### Key references * [GoodRx: What Is Aspirin?](https://www.goodrx.com/aspirin/what-is) * [Aspirin and antiplatelet treatment review in cancer](https://pmc.ncbi.nlm.nih.gov/articles/PMC8351882/) * [BMJ Open: Australian colorectal-cancer prevention context](https://bmjopen.bmj.com/content/11/2/e042261) * [Aspirin in cancer therapy: pharmacology and nanotechnology advances](https://www.dovepress.com/aspirin-in-cancer-therapy-pharmacology-and-nanotechnology-advances-peer-reviewed-fulltext-article-IJN) * [Cleveland Clinic: Aspirin tablets](https://my.clevelandclinic.org/health/drugs/20592-aspirin-tablets)

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