Nutrients commonly taken for focus and cognition. A value comparison, not medical advice. Ranked by real cost per dose. Best value right now: L-Theanine from $0.05/serving.
Prices checked Oct 10, 2026
The nutrients people commonly associate with focus & memory, each shown at its cheapest current cost per dose (per gram for powders). Ranked lowest cost first; no paid placement.
| # | Nutrient | Cheapest pick | Dose basis | Price | Cost / dose | Refs |
|---|---|---|---|---|---|---|
| 1 | L-Theanine | Extra Strength L-Theanine Supplement 400mg | per serving | $18.99 | $0.05/serving | facts |
| 2 | Omega-3 EPA/DHA | Micro Ingredients L-Tyrosine 500 mg Per Serving… | per serving | $19.99 | $0.06/serving | facts · NIH |
| 3 | Lion's Mane | Micro Ingredients Lions Mane+ with Omega-3 EPA… | per serving | $17.59 | $0.07/serving | facts |
| 4 | Creatine | HEARTHY FOODS Creatine Monohydrate Micronized… | per serving | $10.99 | $0.11/serving | facts · NIH |
Ranked by real cost per dose (per gram for powders), not sticker price. We make no health claims — see each linked nutrient page for NIH-sourced facts, or read our methodology.
This page gathers the nutrients people commonly associate with focus & memory and ranks each one by cost per dose — the product’s current price divided by its servings per container, then normalized to one daily dose (or per gram for powders so a 20 g and a 25 g serving compare fairly). The table shows the single cheapest pick we currently track for each nutrient, sorted lowest cost first. Nothing here is paid placement, and a nutrient with no active deals simply drops off the list.
If you are assembling a stack for focus & memory, cost per dose is the figure that tells you what each option actually costs to take day after day — a smaller bottle with a lower sticker price can cost more per serving than a larger one. Use it to compare like-for-like and avoid overpaying; it is a price-comparison signal, not a measure of quality or suitability.
Detailed nutrient facts — intake ranges, food sources, upper limits and safety — live on each linked nutrient hub, sourced from the NIH Office of Dietary Supplements. For the full ranking rules see our methodology and editorial standards.
Commonly: Omega-3 EPA/DHA, L-Theanine, Lion's Mane, Creatine. We make no medical claims — each is ranked here by real cost per dose, with NIH-sourced facts on its nutrient page. Not medical advice.
By cost per dose, Extra Strength L-Theanine Supplement 400mg (L-Theanine) at $0.05/serving is the cheapest per-dose option among the focus & memory nutrients we track as of October 2026.
We link primary sources and paraphrase their findings — never copy their text, tables, or images. Cost-per-dose figures are our own first-party catalog data.