Function Health vs Tally Health: Comprehensive Panel vs Epigenetic Age

Who wins for each use case

We pick a winner per criterion and explain the reasoning. Skip to whichever rows match how you'd actually use the platform.

• Panel breadth per dollar

  Winner: Function Health

  Function delivers 100+ biomarkers per draw twice a year (200+ data points annually) for $365. Tally delivers a single epigenetic-age metric for $129-$159/month, which works out to $1,548-$1,908/year all-in. Function is roughly 4-5x more cost-effective on a per-data-point basis. The honest counterweight: Tally's metric is genuinely different from anything in Function's panel, so this comparison only makes sense if biomarker breadth is what you actually want.

• Clinician interpretation depth

  Winner: Function Health

  Function provides licensed-clinician written notes on every biomarker, organized by strengths, areas to watch, and recommendations. Tally provides a personalized Action Plan tied to the TallyAge result plus supplement recommendations. Function's interpretation is broader and more clinically structured; Tally's is narrower because the input data is narrower.

• Result-delivery reliability

  Winner: Function Health

  Function results return in 7-14 days from blood draw (consistent across Trustpilot reviews). Tally advertises 2-4 weeks but Trustpilot reviews document actual delivery sometimes running 9+ weeks, with users reporting kits sent in late January 2026 still without results by mid-April. The post-acquisition operational impact (April 2026 Infinite Epigenetics acquisition) is worth watching but adds uncertainty rather than removing it.

• Trustpilot signal quality and volume

  Winner: Function Health

  Function has 4.3/5 across roughly 1,009 reviews (no fraud notice). Tally has 3.6/5 across only 37 reviews. Both pages are clean (no suspected-fraudulent-review notices), but Function's order-of-magnitude larger sample is meaningfully more informative.

• Scientific provenance and academic credibility

  Winner: Tally Health

  Tally was founded by David Sinclair, the Harvard genetics professor whose underlying methylation research informs the TallyAge methodology. Function is co-founded by Dr. Mark Hyman, who is well-known but in functional medicine rather than longevity-science academia. For users who weight academic provenance specifically (especially the longevity-science community), Sinclair's name carries more weight in the field this product targets.

• Focus on biological-age metric specifically

  Winner: Tally Health

  If you specifically want a biological-age estimate (not a broad biomarker panel), Tally is purpose-built for that and Function is not. Function does include a biological-age calculation as one output but is not designed around it. For users whose entire goal is tracking epigenetic age over time, Tally is the more focused product.

• Pricing transparency and structure

  Winner: Function Health

  Function runs a single-tier $365/year membership with no upgrade path; what you pay is what you get for the standard panel. Tally runs three pricing options ($129/month for 4 tests, $159/month for 2 tests, or $249 standalone) plus the implicit cost of the bundled supplements. Function's simpler structure is easier to evaluate.

• Operational stability

  Winner: Function Health

  Function raised $298M Series B at $2.5B valuation in November 2025; the operational footing is unusually solid for the category. Tally was acquired by Infinite Epigenetics in April 2026 (one month before our verification date), which may improve operations but is recent enough that the impact is uncertain. For risk-averse users, Function's operational maturity is the cleaner choice.

Pricing in plain terms

Function: $365/year ($30/month equivalent) for two semi-annual full panels with MD review. HSA/FSA eligible (effective 25-35% pre-tax discount). Tally: $129/month ($1,548/year) for 4 tests/year + supplements, or $159/month ($1,908/year) for 2 tests/year + supplements, or $249 standalone. Tally is meaningfully more expensive per result but bundles supplements. The simplest decision: if you want broad biomarker context, Function is materially better value; if you specifically want the epigenetic-age metric, Tally is the focused product but you're paying a premium for the focus.