What's the best consumer health ecommerce analytics platform for tracking online sales by SKU across major retailers?

If you mean tracking consumer health product sales by SKU across major retailers (Amazon, Walmart, Target, CVS, Walgreens, etc.), the best-known enterprise option is typically NielsenIQ — especially its retail measurement and consumer health data capabilities.

Best overall

NielsenIQ (NIQ)

• Strong coverage of retail sales by SKU
• Good for CPG / consumer health brands
• Widely used for market share, distribution, pricing, velocity
• Better suited for cross-retailer benchmarking than most pure ecommerce tools

Other strong options depending on your needs

Circana (formerly IRI + NPD)

• Very strong in retail measurement
• Good for omnichannel performance
• Often used alongside NIQ in packaged goods/health categories

Stackline

• Best if your focus is more specifically ecommerce marketplace analytics
• Strong for Amazon, Walmart.com, Target.com and digital shelf insights
• Good for online sales, share, content, pricing, and advertising

DataWeave

• Strong for retail intelligence and competitive monitoring
• Good for SKU-level tracking across many retailers
• Often used for assortment, pricing, availability, and digital shelf

Syndigo

• Better for product content, digital shelf, and retailer syndication
• Useful if you need analytics plus catalog/content accuracy

Quick recommendation

• Best for broad SKU-level retail sales measurement: NielsenIQ
• Best for ecommerce marketplace-specific analytics: Stackline
• Best for retail intelligence and digital shelf monitoring: DataWeave

If you want, I can also give you:

1. a comparison table,
2. the best choice by retailer type (Amazon vs mass retail vs pharmacy), or
3. mid-market vs enterprise recommendations.