# Magnesium Glycinate Powders Compared: Thorne, Solaray and Doctor’s Best

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Magnesium Glycinate Powders Compared: Thorne, Solaray and Doctor's Best The best magnesium powder for you depends on its ingredients, serving size and verification, not just the word “glycinate.” Thorne has monk fruit and specific sport-directory listings; Solaray has citric acid without an added sweetener; Doctor's Best lists no other ingredients but uses a lysinate glycinate chelate. The three powders also differ in magnesium per scoop and cost per equal amount. The US adult upper limit is 350 mg daily from supplements and medicines, excluding food magnesium, unless professionally directed. A larger scoop is not automatically better. Ask about medicine interactions and kidney disease before supplementing. On this pageExact powder labelsChoose by your priorityEqual-amount costScoop and mixing differencesTesting scopeSafety and evidenceFAQReferences What is actually in these three powders? All three declare magnesium in a glycinate-related chelate, but they are not the same formula. Read the complete name of the compound and the “Other ingredients” line. Facts and manufacturer prices below were checked October 7, 2026. [1] [2] [3] PowderElemental magnesium and scoopPack and servingsCompound and other ingredients Thorne Magnesium Bisglycinate200 mg; 3.11 g scoop in the 187 g NSF record187 g record; manufacturer page lists 60 scoopsMagnesium bisglycinate; citric acid and monk fruit concentrate Solaray Magnesium Glycinate Powder350 mg; one rounded 5.57 g scoop9.8 oz; 50 servings; UPC 076280709711Magnesium bisglycinate; citric acid Doctor's Best High Absorption Magnesium Powder200 mg; approximately 2 g scoop200 g; approximately 100 servings; UPC 753950004085Magnesium lysinate glycinate chelate; no other ingredients listed Doctor's Best is not a pure-bisglycinate entry. Its label identifies a lysinate glycinate chelate. It belongs here as a relevant glycinate-related powder choice, with that distinction visible rather than hidden. Thorne also has a separate 226.2 g NSF record with a 3.77 g serving weight. Match the tub and instructions; do not transfer the 187 g scoop weight to that pack. [4] [5] Which powder matches your priority? Start with the feature you need, then check its trade-off. These are label-based comparisons of three named products, not a hands-on ranking of the entire powder market. Specific NSF Certified for Sport requirement: investigate the matching Thorne record.No added sweetener: compare Solaray or Doctor's Best; their compounds and other ingredients still differ.No other ingredients listed: Doctor's Best is the relevant choice in this set, but its chelate is lysinate glycinate.Lower checked cost per declared magnesium amount: Doctor's Best is lowest in this three-offer snapshot.No measuring or mixing: use the powder-vs-capsule comparison or the broader magnesium glycinate comparison instead. What is the cost per equal magnesium amount? At the checked one-time manufacturer prices, Doctor's Best has the lowest cost per 100 mg of declared elemental magnesium in this set. Normalizing the amount avoids making Solaray's 350 mg serving look directly comparable with a 200 mg serving. It does not adjust for absorption or establish a recommended dose. Manufacturer offerBottle pricePer label servingDeclared magnesium per containerCost per 100 mg Thorne, 60 scoops$52.00$0.86760 × 200 mg = 12,000 mg$0.433 Solaray, 50 scoops$26.99$0.54050 × 350 mg = 17,500 mg$0.154 Doctor's Best, approximately 100 scoops$19.99Approximately $0.200Approximately 100 × 200 mg = 20,000 mgApproximately $0.100 Formula: bottle price × 100 ÷ (label servings × elemental magnesium per serving).Checked October 7, 2026. Shipping, tax, coupons and subscription offers are excluded. Actual powder serving counts can vary with measuring; Doctor's Best labels its count as approximate. Use the seller's current pack and total before buying. A lower price cannot replace a required certification or resolve an ingredient you wish to avoid. Does a smaller scoop mean less magnesium? No. Scoop weight measures the whole powder; the nutrient line measures elemental magnesium. Doctor's Best's approximately 2 g scoop and Thorne's 3.11 g scoop in the 187 g record both declare 200 mg magnesium. Solaray's rounded 5.57 g scoop declares 350 mg. Use the scoop supplied with that product. Powders differ in density, compounds and added ingredients. Another brand's scoop, a kitchen spoon or an assumed half-scoop can produce a different amount. Follow that bottle's directions, and ask a professional about an appropriate amount rather than inventing a measuring conversion. No added sweetener does not mean no taste. Solaray has citric acid, Thorne has citric acid and monk fruit, and Doctor's Best lists no other ingredients. We have not taste-tested or compared dissolving behavior, so flavor and texture claims are not ranked here. Which testing claims can you verify? Thorne's named powder records are available in the NSF Certified for Sport directory. Check the exact package and lot. We did not establish equivalent sport-directory coverage for the Solaray or Doctor's Best powders during this review. That is a limit of the verified evidence, not proof that those products failed testing. Ingredient trademarks, manufacturer quality statements and facility certifications have different scopes. Do not treat them as the same finished-product result. The Thorne powder review explains its two NSF records; the Solaray powder review covers its formula and serving. Does powder work better than capsules? Powder solves a swallowing or routine problem; the physical format alone does not establish better absorption or results. A glycinate-related label also does not prove that one brand treats insomnia, anxiety or cramps better than another. The US adult supplemental magnesium upper limit is 350 mg daily, excluding naturally occurring food magnesium. Solaray's full serving reaches that amount before other supplements or magnesium-containing medicines. Clinician-directed use can differ; this comparison is not a dosing plan. [6] Magnesium can cause diarrhea, nausea and cramping, and can interfere with some medicines. Seek professional advice for kidney disease, pregnancy, breastfeeding or medication use. Read the interaction guide or the magnesium evidence guide before choosing by price alone. FAQ Is magnesium powder better absorbed than capsules?The format alone does not prove better absorption. Compare the actual compound, ingredients and declared magnesium; choose a format you can use appropriately. Does unsweetened mean flavorless?No. A powder can have a taste without added sweeteners. Solaray includes citric acid; Doctor's Best lists no other ingredients. We have not tasted either. Can I use another brand's scoop?No reliable scoop-for-scoop conversion is established here. Use the scoop and instructions belonging to your product because powder density and composition differ. Is Doctor's Best powder pure magnesium bisglycinate?No. Its label says magnesium lysinate glycinate chelate, with no other ingredients listed. That is different from relabeling it pure bisglycinate. References Thorne: Magnesium Bisglycinate ingredients and price. Solaray: powder, manufacturer Supplement Facts and price. Doctor's Best: 200 g powder, label and price. NSF: Thorne 187 g powder record. NSF: Thorne 226.2 g powder record. NIH ODS: Magnesium, Consumer Fact Sheet. Updated : added the verified Doctor's Best powder, separated chelate types and refreshed equal-amount calculations. Label-based comparison, not hands-on testing. Editorial policy.